American Pressure Systems

Search

Search pressure washers, parts, and sealers

APS PartsSKU: VA4G42-FP

Replacement Pressure Washer Pump AR Viper Heavy Duty Belt Drive Plumbed VA4G42-F

$589.00

Free shipping · typically ships in 1–3 business days

Financing available. Apply now with Clicklease

VisaMastercardAmexDiscoverZelle & ACH also accepted — call 800-493-7692

A 2% fuel surcharge and 3.9% processing fee are added at checkout.

Ready to ship
Free shipping
Warranty
Financing available

Low Price Guaranteed

Found it cheaper somewhere else? We'll match it. Call 800-493-7692 and we'll beat the deal.

Overview

The VA4G42-FP is a fully plumbed AR Viper belt-drive replacement pump rated at 4 GPM and 4200 PSI. It's built as a drop-in replacement for machines running a Honda GX390 or Kohler 14HP engine, and it ships assembled so you just mount the pump, set the pressure, and run. The package comes complete with the unloader/regulator (VRT3-310EZ), water inlet fitting with filter, easy start valve, thermo valve, and oil already installed. The pump uses a 24mm shaft and turns at 1750 RPM. It's a good fit for shops and operators rebuilding or upgrading a cold-water belt-drive unit in this flow and pressure class.

What's included

  • Fully plumbed and ready to mount — set pressure and run
  • Rated 4 GPM at 4200 PSI
  • Belt-drive design for lower RPM and longer pump life
  • Fits Honda GX390 and Kohler 14HP engines
  • Includes VRT3-310EZ unloader/regulator
  • Water inlet fitting with filter included
  • Easy start valve and thermo valve included
  • Oil pre-filled

Specifications

Pump
VA4G42
GPM
4
PSI
4200
Shaft
24mm
RPM
1750
Type
Belt Drive
Unloader
VRT3-310EZ

Frequently asked questions

This pump is a replacement for machines running a Honda GX390 or Kohler 14HP engine. It's a belt-drive pump with a 24mm shaft turning at 1750 RPM.

It ships fully plumbed with the pump, unloader/regulator (VRT3-310EZ), water inlet fitting with filter, easy start valve, thermo valve, and oil. Just mount it, set the pressure, and you're ready to go.

Yes. All pumps require both a primary pressure regulating device (regulator or unloader) and a secondary pressure safety relief device (pop-off or safety valve). Failure to install relief devices can cause injury or damage the pump and system.

A belt-drive pump is turned by the engine through a belt and pulleys rather than mounted directly on the crankshaft. This runs the pump at a lower RPM — 1750 here — which generally extends pump life compared to direct-drive.

Talk to a real expert

Our equipment experts

150+ years combined on the equipment

Talk to someone who actually knows the machine

Skip the chatbot maze. Call and you get a specialist who can size the right unit, match the exact part, and match the right sealer. Usually faster than figuring it out yourself.

Mon–Fri 8am–5pm ET Family-owned, US-based