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This AR RK Series 1750 RPM 4 GPM 1-1/8″ Hollow Shaft Pump is designed for a wide variety of high pressure washing applications. It is constructed with a die-cast body.

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Annovi Reverberi AR RKA4G20E-F17 1750 RPM Hollow Shaft Pump

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AR RK Series Plunger Pumps are designed for a wide variety of high pressure washing applications. They are constructed of die-cast bodies and feature a forged brass head. Internal components include special thick solid ceramic plungers for long life and durability. Precision cast cooling fins are anodized for maximum heat dissipation. Oversized tapered roller bearings and the precision supports assure proper shaft alignment and maximum life. Valve cages of special designed Ultra-Form provide positive seating and extended life. One-piece connecting rods are either a special alloy aluminum or bronze oversized for strength and load disbursement. These pumps are designed for gearbox , belt drive, or coupling drive systems, electric motor 182-184 frame driven systems, or gasoline driven systems.


  • Shaft Size:1 1/8″ Hollow

  • Maximum RPM: 1750

  • Maximum GPM: 4

  • Maximum Pressure: 2000 PSI

  • Maximum Horsepower Requirements: 5 BHP

  • Maximum Fluid Temperature: 140 F

  • Bore Diameter: 18mm

  • Stroke: 12mm

  • Inlet Thread: 1/2″ F

  • Discharge Thread: 3/8″ F

  • Oil Capacity: 15 oz.

  • Approximate Weight: 21 lbs.

Weight 22 lbs
Shaft Diameter

1.125 in / 28.575 mm

Max Volume

4.0 GPM

Max Discharge Pressure

2000 PSI

Max Pump Speed

1750 RPM

Bore Diameter

.709 in / 18 mm


.472 in / 12 mm

Max Fluid Temp.

140 F

Inlet Port

1/2-14 BSPP-F

Discharge Port

3/8-19 BSPP-F






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