AR RRV4G40-VRT-PKG: The Ready-to-Go Replacement Pump for 13HP Pressure Washers

If your gas pressure washer's pump is worn out, leaking, or losing pressure, and it runs on a 13hp engine with a 1-inch horizontal shaft, the Annovi Reverberi RRV4G40-VRT-PKG is a direct, fully-assembled replacement. It puts out 4.0 GPM at 4000 PSI, bolts straight onto the engine's mounting flange, and comes with the unloader, inlet strainer, bypass hose, and quick-connect fitting already installed. American Pressure Inc. sells it for $399.99, which is one of the best prices you'll find on this pump brand new. You're welcome to check around and compare.

Is This Pump a Match for Your Machine?

This is the question most people are actually asking, even if they typed something else into the search bar. Before you buy, confirm three things:

• Shaft type and size: 1-inch hollow horizontal shaft. If your engine has a solid shaft or a different diameter, this pump won't fit without an adapter.
• Engine size: Built for most 13hp gas engines with a standard mounting flange.
• Output needs: 4000 PSI and 4.0 GPM covers the vast majority of contractor-grade and heavy-duty homeowner pressure washers in this engine class.

If those three line up, this pump is a straightforward swap.

What "Ready to Go" Actually Means

A lot of replacement pumps ship as bare units, meaning you're sourcing an unloader, strainer, hoses, and fittings separately before you can even test it. The RRV4G40-VRT-PKG isn't that. It arrives as a complete assembly:

• VRT3-310 EZ Start unloader valve, already mounted
• Brass line strainer with cone filter and garden hose inlet
• 1/2" black bypass hose with a thermal relief valve
• 3/8" quick-connect brass socket and steel plug on the outlet
• External bypass loop

You mount it to the engine, connect your hoses, and run it. No sourcing extra parts, no guessing on compatibility between an unloader from one brand and a pump from another.

Full Specifications

Spec	Detail
Brand	AR North America (Annovi Reverberi)
Model #	RRV4G40-VRT-PKG
Max PSI	4000
Max GPM	4.0
RPM	3400
Shaft	1 in. hollow, horizontal
Pump type	Triplex plunger
Mounting	Gas engine flange, fits most 13hp engines
Inlet	Garden hose thread, brass strainer w/ cone filter
Outlet	3/8" quick-connect brass
Unloader	VRT3-310 EZ Start, externally adjustable
Bypass	External loop, 1/2" black hose, thermal relief valve
Price	$399.99

Why a Triplex Pump Instead of an Axial Pump

If you're comparing pump types rather than shopping by model number, this matters. Triplex plunger pumps like this AR unit use three ceramic plungers instead of the wobble-plate design in cheaper axial pumps. That translates to a longer service life, better pressure consistency under load, and the ability to run at higher duty cycles without overheating. This is the pump architecture used across nearly all commercial and semi-commercial pressure washers, which is why it's a common upgrade even for people replacing a failed axial pump on a consumer-grade machine.

Common Reasons People Land on This Page

• Their factory pump seized, cracked a manifold, or started leaking oil or water
• They're building a pressure washer from a bare engine and skid, and need a pump that doesn't require sourcing separate hardware
• They're upgrading from a lower-output pump and want to hit 4000 PSI / 4.0 GPM on the same 13hp engine
• They searched for "Annovi Reverberi replacement pump," "1 inch shaft pressure washer pump," or "4000 PSI triplex pump for 13hp engine" rather than the model number directly

Installation Notes

Since the pump ships assembled, installation is mechanical, not a build project. Align the pump's shaft coupling with the engine's output shaft, secure it to the mounting flange, connect the garden hose inlet to your water supply, and attach your high-pressure hose to the quick-connect outlet. The unloader is already plumbed with the bypass loop, so there's no separate bypass assembly to install. Confirm the unloader is set to full pressure before first startup, and run water through the system before engaging the engine to avoid dry-running the plunger seals.

Where to Buy It

American Pressure Inc. carries the AR RRV4G40-VRT-PKG in stock for $399.99, brand new, which is among the lowest prices we've found for this exact model anywhere else it's sold.

---

FAQ

Does this pump fit a Honda GX390 13hp engine? Yes, as long as your engine has the standard 1-inch horizontal hollow shaft and matching mounting flange, which the GX390 does in its pressure washer configuration.

Does the RRV4G40-VRT-PKG come with an unloader valve? Yes. It ships with the VRT3-310 EZ Start unloader already mounted, along with the bypass hose and thermal relief valve.

What's the difference between the RRV4G40 and other AR pump models? The "VRT-PKG" designation means this version comes as a complete ready-to-run assembly with the unloader, strainer, and fittings included, rather than as a bare pump you'd need to outfit separately.

Is 4000 PSI and 4.0 GPM enough for commercial pressure washing? Yes, this output range covers most contractor-grade cleaning work, including concrete, fleet washing, and building exteriors. It's one step below the highest-output triplex pumps used for heavy industrial applications.