Beli Piston Kompresor bekas (3.440)

Kondisi: baru, Tahun pembuatan: 2024, nomor mesin/kendaraan: MA0173, translation-001 Gkodpfsityx Tjx Adqoc

Kondisi: bekas, Tahun pembuatan: 2013, nomor mesin/kendaraan: 81300019158, Kolbenpumpe und -kompressor für CTP Anlagen / Piston pump and compressor for CTP processors (example: Agfa) Gkjdpfoh Eg Txex Adqec CTP Processor Thomas - Rietschle 2750BGHISS75 Year of manufacture: 2013 Serial number: 081300019158 Online video inspection possible via Skype. We look forward to your visit – additional machines in stock. Available immediately and can be inspected. Located in Emskirchen / Nuremberg – testing possible on site.

Kondisi: baru, Perlengkapan: sistem udara terkompresi, Refrigeration dryer, condensate drain, oil-water separator, and pre-/fine filter Designed for applications where compressed air quality as well as durability and efficiency are essential V-belt drive Long service life thanks to 2-stage high-performance units with low speed Specially machined cast cylinders for minimal oil consumption and extended lifespan Optimal cooling through large fan wheel Motor with overload protection Easy condensate drainage via standard-installed 1/2" ball valve Standard equipped with Condor pressure switch and pressure gauge Supplied as standard on safety pallet with vibration-damping mounts Tank manufactured in accordance with German AD 2000 regulations Suction capacity: 650 l/min Filling capacity: 520 l/min Maximum pressure: 10 bar Tank volume: 270 l Cylinders/stages: 2/2 Speed: 920 min-1 Gjdpfx Adjwwi Acjqekc Motor power: 4 kW / 400 V

Kondisi: baru, Manufacturer: Trane Model: CRHR400 G2HBO Type: Compressor Technical Specifications: Godpfx Adju Eb Aijqokc Volume flow rate: 145.3 m³/h Maximum discharge pressure: 28 bar Speed: 1450 rpm Voltage: 380/415 V 3-phase 100/92 A 50 Hz New price: €11,043 Item condition: new

Kondisi: bekas, Technical details: Pressure output: 8 bar Output capacity: 200 l/min Number of cylinders: 2 pcs. Air tank: 50 liters Total power: max. 1.5 kW Gsdpfsu Nz Dbsx Adqokc Weight: approx. 33 kg Dimensions (L x W x H): 0.75 x 0.35 x 0.68 m The air compressor is delivered in its original packaging and sold exclusively to commercial customers (without warranty) ex Leipzig for €119.00. Specifications: - Single-phase compressor - Power cable and two-pole mains plug with grounding contact - Mobile - Electric motor 220V - Air-cooled - Operating manual

Tahun pembuatan: 2023, Kondisi: bekas, nomor mesin/kendaraan: ITR1893011, New exhibition machine!!! List price €2,986 net! Technical Data: Pressure: 10 bar Intake capacity: 650 l/min Effective delivery rate: 520 l/min Drive power: 4.0 kW Speed: 1,025 rpm Tank volume: 2x90 L Weight: 175 kg Noise level: 83 dB(A) Air outlet: 1/2 inch Dimensions (W x D x H): 1,200 x 800 x 1,240 mm Design: V-belt driven piston compressor mounted on two horizontal pressure vessels, fully assembled on a safety tray, including all piping. Gksdpfx Adovxxvieqoc Complete Equipment: The ready-to-connect configuration includes: - Pressure switch for fully automatic operation - Start-up relief valve and motor protection - Safety valve - Check valve - Pressure gauge V-belt driven compressor unit: The belt drive ensures a clear and accessible layout of all components. All maintenance-relevant elements can be easily removed or installed.

Kondisi: seperti baru (mesin pameran), Tahun pembuatan: 2023, jam operasional: 1 h, Showroom model: New piston compressor immediately available (Plug and Play): AIRKO MAXXI 5.5 D - 270 ST - 10 bar with 270-liter vertical compressed air tank with star-delta starter The compressor has 1 operating hour and is immediately available. 2 cylinders Pressure: 10 bar Gkjdpfx Asrmnp Hodqoc Rated power: 5.5 kW Delivery rate at 7 bar: 605 l/min Sound level: 80 dB(A) Compressed air outlet: 1/2" Dimensions (L x W x H): 86 x 85 x 210 cm Weight: 173 kg Convenient leasing available through our partner bank. Visit our showroom. We always have a large selection of new and used compressors in stock! Immediately available.

Kondisi: baru, Aircraft AIRPROFI 503/100 P Reciprocating Compressor Mobile professional compressor with belt drive and high-performance two-cylinder cast iron unit, featuring top-of-the-line equipment. TECHNICAL DATA Dimensions and Weights Length (product): approx. 1275 mm Width/Depth (product): approx. 480 mm Height (product): approx. 925 mm Weight (net): approx. 76 kg Electrical Data Supply voltage: 400 V Mains frequency: 50 Hz Output power: 3 kW Input power: 3.67 kW Gsdpfot Ifhajx Adqjkc Noise Emissions Sound power level Lw: 93 dB(A) Sound power level as per DIN EN ISO 3744 (Directive 2000/14/EC) Compressor Compressor type: HOS Intake capacity: approx. 510 l/min FAD (Free Air Delivery): approx. 400 l/min (FAD measured at 6 bar working pressure) Number of cylinders: 2 Number of stages: 1 Compressor speed: 1310 rpm Compressed Air Receiver Maximum pressure: 10 bar Tank capacity: 100 l FEATURES Pressure regulation via filter pressure regulator Automatic pressure switch CONDOR Power transmission via V-belt Compressed air line material: flexible armoured hose with heat protection Compressed air preparation: filter pressure regulator, oil mist lubricator Compressed air outlets: two comfort safety couplings, one ball valve Compressed air receiver: hot-dip galvanized inside and outside, with fifteen-year warranty against rust-through Base: two wheels with PU foam tyres, two swivel castors with parking brakes

Tahun pembuatan: 2001, Kondisi: baik (bekas), Mycom kølekompressor. Godpfx Aogfnpdedqskc Type: N8WB. Serienummer: 83 13 12. Produktionsår: 2001. Kølemiddel: NH3. 110 kW. Kapacitet: 171 kW ved -32/-10°C. Kapacitet: 316 kW ved -10/+35°C.

Tahun pembuatan: 2005, Kondisi: seperti baru (mesin pameran), Fungsionalitas: berfungsi sepenuhnya, Used Metabo Ct750 / lt 270 Compressor 2005 Brand: Metabo Model: Biugincfpo CT750 / LT 270 Description: Manufacturer: Metabo Type / Model: CT750 / LT 270 Year of manufacture: 2005 Machine category: Piston Compressor Location: Gorzów Wlkp. Delivery Conditions: Group collection and shipping by arrangement Delivery cost: To be agreed Buyer protection: Available Method of handover: To be agreed Details / Comments: COMPRESSOR CT 750/270 The compressors from the Italian brand SHAMAL® are top quality devices, ensuring long and trouble-free operation. The CT 750/270 compressor, equipped with a high-performance, two-stage cast iron pump (double stage), with an output of 44 m³/h, is suitable for automotive workshops, construction, and industrial applications. It features thermal protection and an unloader valve for easier restart. The tank is fitted with a pressure regulator and two quick-release couplings. Standard equipment includes a pressure switch, safety valve, pressure regulator with pressure gauge, check valve, and drain valve. Technical Data: Power supply [V]: 400 Tank capacity [l]: 270 Output capacity [l / min]: 727 Output capacity [m³ / h]: 44 Motor power [kW]: 5.5 Revolutions per minute [rpm]: 1000 Maximum pressure [bar]: 10 Noise level [dB]: 76 Number of pistons: 2 Compression stages: 2 Dimensions [LxWxH]: 1700x600x1270 mm Weight [kg]: 177 Year: 2005 Gkjdpfx Asvz Igvedqjc

Kondisi: bekas, Tahun pembuatan: 1988, Technical details: Tank: 300 l Flow rate: 350 L/min Power requirement: 4.3 kW Weight: 340 kg Dimensions (L x W x H): 1.9 x 0.6 x 1.2 m Compressor: Geraer Kompressorenwerk 2 cylinders; 350 l/min; Max. pressure: 2.1 MPa, Rated pressure: 1.6 MPa Motor: ADDA Antriebstechnik GmbH Speed: 2,870 / 3,444 rpm; Voltage: 380V Gkjdpfx Asu Nz Eledqec Air receiver: Geraer Kompressorenwerk Size: Ø 550 x 1,800 mm, with 3/4" and 1/2" shut-off valves, pressure gauge Inspection valid until 07/2022

Kondisi: baru, A batch of Einhell compressed air accessories worth 13,500 euros is for sale. Gsdorl Sk Iopfx Adqokc 4 pallets filled with Einhell compressed air accessories. We will gladly send you a list of the items upon request.

Tahun pembuatan: 2021, Kondisi: baru, nomor mesin/kendaraan: MA0134_MAXXI5,5, Exhibition machine: New piston compressor immediately available (Plug and Play): AIRKO MAXXI 5.5 D – 270 – 10 bar with horizontal 270-liter compressed air receiver Year of manufacture: 2021 The compressor has only 1 operating hour and is available for immediate delivery. 2 cylinders Pressure: 10 bar Rated power: 5.5 kW Delivery capacity at 7 bar: 605 l/min Sound level: 80 dB(A) Compressed air outlet: 1/2" Dimensions (L x W x H): 170 x 56 x 134 cm Gjdpfx Adohu R Akjqjkc Weight: 181 kg Convenient leasing available through our partnered bank. Visit our showroom. We always have a large selection of new and used compressors in stock! Available immediately.

Kondisi: baru, Aircraft AIRBAU 652/100 B PRO Piston Compressor Mobile compressor with combustion engine for operating pressures up to 14 bar—ideal for worksites without electrical power supply. TECHNICAL DATA Dimensions & Weights Length (product): approx. 1050 mm Width/Depth (product): approx. 500 mm Height (product): approx. 1060 mm Weight (net): approx. 121 kg Electrical Data Drive motor: 1-cylinder, 4-stroke engine Power input: 6.6 kW Noise Emission Sound power level Lw: 99 dB(A) Notes on sound power level: Measured according to DIN EN ISO 3744 (Directive 2000/14/EC) Gkodpfx Adet H N Nxsqsc Compressor Compressor system: HOS Intake capacity: approx. 642 l/min FAD (Free Air Delivery): approx. 480 l/min Note on FAD: measured at 6 bar working pressure Number of cylinders: 2 Number of compression stages: 2 Compressor speed: 950 rpm Air Receiver Maximum pressure: 14 bar Tank capacity: 100 L FEATURES Pressure control: Filter regulator Automatic pressure switch: CONDOR Drive transmission: V-belt Compressed air line material: Flexible armoured hose Air preparation: Filter regulator Compressed air outlet: One high-quality quick coupling Air receiver finish: Powder-coated Tank base: Two wheels with PU foam tyres, one rubber buffer

Kondisi: bekas, Reciprocating Compressor / Aftercooler Manufacturer: Kaeser Gkodpfx Adjwp Havjqoc Model: N 351-G Inlet Pressure: 6.5 bar to 7.4 bar Max. Final Pressure: 25 bar Electrical Connection: 400V / 3 / 50Hz Drive Motor Speed: 3,000 rpm Rated Power: 11.0 kW / 0.52 kW Ambient Temperature: 2°C - 40°C Total Weight: 670 kg Including control system Compressed Air Tank 100/45 / Steel / galvanized ECO-DRAIN 12 FC Pre-filter 1 μm Type: FC-28 Condition: Used item Scope of delivery as shown in the pictures Please contact us if you have any questions Shipping: The stated shipping costs apply to deliveries within Germany Worldwide shipping available (please request shipping costs outside Germany) The given shipping costs apply to shipping within Germany Sale only to commercial customers, with no warranty or guarantee of any kind Technical data may be subject to change. Errors in the description are possible and subject to correction.

Kondisi: baru, The new compressor from Hauslhof, in extra robust, long-lasting construction. - Powerful high-performance unit - Cylinders and unit housing made from cast iron - Thick-walled air receiver for extended service life - V-belt drive with extra-large fan wheel - Condor pressure switch with pressure gauge - Pressure regulator - High delivery rate - Aftercooling fins - Start-up relief valve - 1/2" connection with shut-off valve - Replaceable air filters - Drain valve - Powder-coated - Mobile Made in Europe, CE compliant Technical specifications: Intake volume: 500 l Delivery output: 350 l Tank capacity: 100 l Max. pressure: 9 bar Cylinders: 2 Motor output: 3 kW at 100% duty cycle, 400 V Unit speed: 1635 rpm Noise level: 79 dBA Gksdpovrvzpsfx Adqjc Weight: 92 kg Dimensions (L x W x H): 1150 x 500 x 850 mm

Kondisi: sangat baik (bekas), Tahun pembuatan: 2001, JUN-AIR compressor in soundproof enclosure Model 2000-25M Pressure (PS) 16.0 bar Continuously adjustable Tank volume 25 liters Integrated air dryer Very well maintained Godpfx Aowpupxodqskc Only 204 operating hours in a clean environment. Dimensions (LxWxH) in mm: 450 x 660 x 860 Swivel castors with parking brake Noise level up to 52 dB, suitable for use in noise-sensitive environments.

Kondisi: baru, Tahun pembuatan: 2024, Fungsionalitas: berfungsi sepenuhnya, Alternative and genuine spare parts for all types of starting air compressors, reciprocating compressors, and screw compressors. Sperre, Hatlapa, Sauer & Sohn, Hamworthy, Ervor, Espholin, Alkin, Atlas Copco, Ingersoll Rand, Kaeser. Gjdowhb N Nepfx Adqjkc

Tahun pembuatan: 2017, Kondisi: hampir baru (bekas), Used RENNER REKO 550/50VE Air Compressor 10 bar with Petrol Engine Ideal for operations without a power supply (e.g. roadside assistance service vehicles or mobile tyre service) This compressor is used, built in 2017, and has 50 operating hours. The robust, petrol-driven piston compressors offer you – in addition to the well-known RENNER system advantages – especially flexible compressed air supply on construction sites, in service vehicles, and many other applications 'off the grid'. They ensure a constant supply of compressed air, regardless of location. The small version is mobile and can be quickly relocated thanks to the ergonomic handle, while the larger version, due to its compact design, can be easily moved with a pallet jack or forklift and loaded onto vehicles. VE = Electric Start. Please note: Supplied without battery. Technical data: - Intake capacity: 550 l/min - Effective delivery: 400 l/min - Petrol engine: 3.6 kW Honda unit with 4.8 HP - Max. pressure: 10 bar - Cylinders/stages: 2/1 Gkodod H Dr Sspfx Adqjc - Speed: 1,400 rpm - Sound level: 98 dB(A) - Air receiver: 50 l - Dimensions (L x W x H): 810 x 460 x 830 mm - Weight: 70 kg Visit our showroom in Erlangen. We offer a large selection of new and used compressors.

Kondisi: baru, Aircraft AIRPROFI 1003/500/10 H Silent Piston Compressor Designed for professional and industrial use where a quiet working environment is required. Gsdpfot H N Nlex Adqekc DESCRIPTION - Exceptionally quiet due to sound-insulated housing and additional silencer on the intake filter - Suitable for installation in noise-sensitive areas and directly at the workplace - Two-cylinder high-performance unit made of gray cast iron with low speed ensures particularly smooth and low-vibration operation: reduced wear and extended service life - Large fan wheel at the compressor and temperature-controlled radial fan at the housing provide optimal cooling of the entire interior - Intercooler and aftercooler as well as an additional air channel between motor and compressor reduce condensate formation - High-quality Condor pressure switch - Equipped with glycerine-filled pressure gauge, hour meter, and fault indication via LED lights - Premium electric motor with motor protection switch and starting relief - Integrated phase monitoring - Device for easy belt tensioning - Service-friendly design - Ready for connection with all fittings and safety devices - Models with air receiver: internally and externally galvanized air receiver with a 15-year anti-corrosion guarantee General Information Air outlet: ¾” Dimensions and Weights Length (Product): approx. 2020 mm | Width/Depth (Product): approx. 980 mm Height (Product): approx. 1840 mm | Net Weight: approx. 410 kg Electrical Data Supply Voltage: 400 V | Network Frequency: 50 Hz Output Power: 7.5 kW | Power Consumption: 8.71 kW Noise Emission Sound Pressure Level Lp: 64 dB(A) (measured at 1 m distance in accordance with DIN 45635 T 13) Compressor Compressor System: HOS | Intake Capacity: approx. 1080 l/min Filling Capacity: approx. 770 l/min (at 6 bar working pressure) Number of Cylinders: 2 | Number of Compression Stages: 2 Compressor Speed: 1100 min¯¹ Air Receiver Max. Pressure: 10 bar | Tank Capacity: 500 l EQUIPMENT Drive Transmission: V-belt | Compressed Air Line Material: Flexible armored hose with heat protection Compressed Air Removal: Ball valve | Air Receiver: Internally and externally hot-dip galvanized with fifteen-year anti-corrosion guarantee AD 2000 compliant: yes | Tank Base: Vibration isolators Star-delta switch: ✔

Kondisi: seperti baru (mesin pameran), Tahun pembuatan: 2025, jam operasional: 1 h, nomor mesin/kendaraan: MA0138_MAXXI4,0D_270st, Demo unit: New piston compressor immediately available (Plug and Play): AIRKO MAXXI 4.0 D - 270 ST - 10 bar with 270-liter upright compressed air tank The compressor has 1 operating hour and is immediately available. 2 cylinders Pressure: 10 bar Rated power: 4.0 kW Output at 7 bar: 495 l/min Sound level: 78 dB(A) Compressed air outlet: 1/2" Dimensions (L x W x H): 155 x 59 x 113 cm Weight: 134 kg Gedjd Hy T Ajpfx Adqekc Attractive leasing options available through our partner bank. Visit our showroom. We always have a wide selection of new and used compressors in stock! Available immediately.

Kondisi: baru, Aircraft AIRSTAR 603/90 Piston Compressor Mobile piston compressors with belt drive. TECHNICAL DATA Dimensions and Weight Length (product): approx. 1030 mm Width/Depth (product): approx. 440 mm Height (product): approx. 850 mm Weight (net): approx. 71 kg Electrical Data Connection voltage: 400 V Mains frequency: 50 Hz Drive motor: Electric motor Output power: 3.0 kW Power consumption: 3.67 kW Duty cycle drive motor: 75% Noise Emission Sound power level Lw: 94 dB(A) Explanation Sound power level: Sound power level according to DIN EN ISO 3744 (RL 2000/14/EC) Sound pressure level Lp: 77 dB(A) Explanation Sound pressure level: Sound pressure level measured at 1 m distance according to DIN 45635 T 13 Compressor Compressor system: HOS Oil-free / Oil-lubricated: Oil-lubricated Intake capacity: approx. 510 l/min FAD (Free Air Delivery): approx. 400 l/min Note: FAD at 6 bar working pressure Number of cylinders: 2 Number of compression stages: 1 Compressor speed: 1310 rpm Piston stroke: 58 mm Piston diameter: 65 mm Compressed Air Receiver Maximum pressure: 10 bar Receiver capacity: 90 l Receiver orientation: Horizontal Receiver surface: Powder-coated EQUIPMENT Pressure regulation: Filter pressure regulator Automatic pressure switch: CONDOR Godpfxet H N R Ae Adqekc Drive transmission: V-belt Compressed air pipe material: Copper Compressed air treatment: Filter pressure regulator Compressed air outlet: One safety coupling Condensate drain: Ball valve Compressed air receiver: Powder-coated with ten-year corrosion warranty Receiver base: Two wheels with PU foam tires, two swiveling castors with locking brakes Connection cable: 2 m Connection plug: 400 V CEE plug with phase inverter

Kondisi: baru, Aircraft AIRPROFI 401/50 P Mobile Piston Compressor with Belt Drive (2018410.2) Professional compressors featuring a 2-cylinder high-performance cast iron unit and fully equipped to the highest standard. TECHNICAL DATA Dimensions and Weights Length (approx.): 810 mm Width/Depth (approx.): 430 mm Height (approx.): 790 mm Net weight (approx.): 56 kg Electrical Data Supply voltage: 230 V Mains frequency: 50 Hz Output power: 2.2 kW Power consumption: 2.76 kW Noise Emission Sound power level Lw: 96 dB(A) Sound power level measured in accordance with DIN EN ISO 3744 (Directive 2000/14/EC) Compressor Compressor system: HOS Intake capacity (approx.): 365 l/min FAD (approx.): 266 l/min (FAD measured at 6 bar working pressure) Number of cylinders: 2 Number of compression stages: 1 Compressor speed: 1360 rpm Gjdpekzk Agefx Adqokc Compressed Air Receiver Max. pressure: 10 bar Tank capacity: 50 l EQUIPMENT Pressure control: Filter pressure regulator Automatic pressure switch: CONDOR Compressed air line material: Flexible armored hose with heat protection Air treatment: Filter regulator, water separator, lubricator (mist oiler) Compressed air outlets: Two comfort safety couplings, one ball valve Compressed air receiver: Hot-dip galvanized inside and out, with fifteen-year anti-corrosion warranty Base: Two wheels with PU foam tires, two swivel castors with parking brake Made in Europe

Kondisi: baru, Aircraft AIRSTAR 503/50 SAR Reciprocating Compressor Mobile reciprocating compressors with belt drive. High-quality features and integrated hose reel. TECHNICAL DATA Dimensions and Weight Length (product): approx. 860 mm Width/depth (product): approx. 500 mm Height (product): approx. 880 mm Net weight: approx. 68.2 kg Electrical Data Supply voltage: 400 V Mains frequency: 50 Hz Output power: 3 kW Input power: 3.67 kW Noise Emission Sound power level Lw: 94 dB(A) Explanation: Sound power level measured in accordance with DIN EN ISO 3744 (RL 2000/14/EC) Compressor Compressor system: HOS Intake capacity: approx. 510 l/min FAD (Free Air Delivery): approx. 400 l/min Note: FAD at 6 bar working pressure Gsdpfxjt Ifgio Adqjkc Number of cylinders: 2 Number of compression stages: 1 Compressor speed: 1,310 min⁻¹ Air Receiver Maximum pressure: 10 bar Tank volume: 50 l SCOPE OF DELIVERY SAR 8/10 RP hose reel Hose length: 10 m Hose inner diameter: 8 mm FEATURES Pressure regulation: High-quality filter pressure regulator Automatic pressure switch CONDOR Drive transmission: V-belt Material compressed air line: Flexible armored hose with heat protection Compressed air treatment: Filter pressure regulator Compressed air outlet: One composite safety coupling Condensate drain: Condensate drain valve Air tank: Powder-coated with a ten-year warranty against rust-through ZÜS tested: Inspection before commissioning also possible by a qualified person Tank base: Two wheels with PU foam tires, two swivel castors with parking brake

Kondisi: baru, Aircraft MOBILBOY SILENCE 401/50 OF E Piston Compressor Oil-free, exceptionally quiet compressor for mobile applications DESCRIPTION - Exceptionally quiet operation for minimal noise emissions - Oil-free piston compressor: no oil changes required, no oil in condensate – ensuring optimal air quality - Pressure regulator for stepless adjustment of desired working pressure - High-quality pressure switch - Electric motor equipped with motor protection switch - Fully automatic start/stop operation - Individual pressure gauges for tank and working pressure - Powder-coated compressed air receiver TECHNICAL DATA General Information - Air outlet: ¼" Dimensions and Weight - Length (product): approx. 800 mm - Width/depth (product): approx. 360 mm - Height (product): approx. 720 mm - Net weight: approx. 40 kg Electrical Data - Rated voltage: 230 V - Mains frequency: 50 Hz - Output power: 2.2 kW - Input power: 2.3 kW - Duty cycle of drive motor: 70% Noise Emission - Sound pressure level Lp: 67 dB(A) - Sound pressure measured at 1 m in accordance with DIN 45635 T 13 Compressor - Compressor system: WDS - Oil-free / oil-lubricated: Oil-free - Suction capacity: approx. 400 l/min - Effective delivery rate: approx. 180 l/min - Delivery rate specified at 6 bar working pressure - Number of cylinders: 2 - Number of compression stages: 1 - Compressor speed: 2850 min¯¹ - Piston stroke: 18 mm - Piston diameter: 69.7 mm Compressed Air Tank - Maximum pressure: 10 bar - Tank capacity: 50 l Gsdpjt H N I Usfx Adqekc - Tank orientation: horizontal - Tank surface: powder-coated EQUIPMENT - Pressure control: filter pressure regulator - Automatic pressure switch: ✔ - Drive transmission: direct-drive - Compressed air line material: flexible armoured hose with heat protection - Compressed air outlets: two one-hand quick couplings - Air receiver: powder-coated - Tank base: two solid rubber wheels, two rubber buffers - Connection cable: 1.5 m - Plug: CEE 7/4