RKV4037VR35IDR | 3400 RPM Industrial Triplex Pump Package

RKV4037VR35IDR | 4 GPM 3700 PSI Gas Engine Pump with VR35 Dump Unloader and Injector, 1 in. Hollow Shaft

The RKV4037VR35IDR is an Annovi Reverberi RK triplex plunger pump rated 4.0 GPM at 3,700 PSI at 3400 RPM, with a VR35 IDR unloader and chemical injector already installed. It slides onto a 1 in. engine shaft, bolts to the engine face, and is ready to plumb: no belts, no separate unloader to buy, no injector to add.

The IDR is a dump regulator. When the trigger is released, it sends flow to bypass and also dumps the pressure left in the hose, so the line is not left holding 3,700 PSI between passes. That means less strain on hoses, couplers and fittings, an easier restart, and a safer handoff between operators.

What’s in the Box

• RKV4037VR35IDR pump with 1 in. hollow shaft engine mount
• VR35 IDR dump unloader with chemical injector, installed
• Crankcase oil, pre-filled at the factory
• Vented dipstick. The pump ships with a shipping plug in the oil port. Swap in the dipstick before the first start.
• Engine mounting bolts and lock washers
• Operation manual and parts schematic
• 5-year Annovi Reverberi warranty

The shaft key is not included. It comes with your engine, and its size is set by the engine maker.

Will It Fit My Machine?

• Shaft: your engine has a 1 in. keyed horizontal shaft.
• Mount: compare the bolt pattern on your engine face with the old pump before ordering.
• Engine size: 389cc to 420cc (13 HP class and up).
• Bypass line: run the VR35 bypass port back to the tank or pump inlet.
• Detergent: the injector draws chemical at low pressure. Use a low-pressure soap nozzle to pull detergent.

Not sure? Text a pump specialist at (505) 226-6061 with a photo of your engine tag and we’ll confirm the fit.

What Else You’ll Need

• Thermal relief valves and inlet filters: the thermal valve protects the pump during long bypass periods, and the filter keeps debris out of the valves.

RKV4037VR35IDR Specifications

• Model: RKV4037VR35IDR
• Flow: 4.0 GPM
• Max Pressure: 3,700 PSI
• Speed: 3400 RPM (engine speed)
• Gas Engine Size: 389cc to 420cc
• Shaft: 1 in. hollow
• Unloader: AR VR35 IDR dump regulator with chemical injector, installed
• Plungers: Ceramic
• Max Water Temperature: 140°F
• Weight: 21 lbs
• Warranty: 5 years
• Brand: Annovi Reverberi

Shipping: Usually ships via UPS in 1 to 3 days.