RKV4G37-PKG | 4.0 GPM 3700 PSI Triplex Pump, F24 Flange Mount

RKV4G37-PKG by Annovi Reverberi — Complete Triplex Pump Package | 4.0 GPM | 3,700 PSI | Bronze Connecting Rods | Forged Brass Manifold | Garden Hose Adapter | Stainless Inlet Filter | Gymatic C2 Unloader | F24 SAE J609a 1″ Shaft | Direct Drive Gas Engine | 14,800 Cleaning Units

The RKV4G37-PKG by Annovi Reverberi is a complete, installation-ready RKV Series triplex ceramic plunger pump package engineered for direct drive gas engine-powered pressure washing systems requiring 4.0 GPM at 3,700 PSI. Rated at 4.0 GPM and 3,700 PSI, the RKV4G37-PKG delivers 14,800 cleaning units — the output of a professional cleaning platform built for contractor rigs, fleet wash bays, agricultural operations, industrial facilities, and OEM skid systems — through bronze connecting rods, solid ceramic plungers, a forged brass manifold, stainless steel valves, dual redundant packing, and an F24 SAE J609a direct-drive flange with 1″ shaft. This package includes the two components most often forgotten: a garden hose adapter and a stainless steel inlet filter — so the water supply is connected and protected the moment installation is complete. Mount it. Thread on the garden hose. Connect the high-pressure hose. Wash. As part of Annovi Reverberi’s pump and unloader assemblies stocked and supported by WSHPWR, the RKV4G37-PKG is the complete answer for operators who need 3,700 PSI with nothing left to source.

The RKV4G37-PKG is a factory-engineered, factory-assembled, factory-tested complete system — designed by Annovi Reverberi in Modena, Italy and distributed across North America by AR North America. Whether you are replacing a worn pump on a contractor trailer, building a new skid for a fleet wash bay, specifying a pump for an OEM installation, or outfitting a Predator-powered flatbed — the RKV4G37-PKG eliminates every compatibility question and every missing component before the box is opened. Protected by a 5-year US limited warranty and built to be fully rebuilt rather than replaced, this is a decade-of-service investment.

Everything in One Box — The RKV4G37-PKG Complete Package Contents

Garden Hose In. High-Pressure Hose Out. Protected Pump. Nothing Left to Source.

Open the RKV4G37-PKG box and find everything required for a complete, same-day engine-to-pump installation — including the inlet hardware that prevents the most common first-day pump failures:

• RKV4G37 triplex ceramic plunger pump — factory-tested and pre-lubricated with break-in oil. Bronze connecting rods, solid ceramic plungers, forged brass manifold, stainless steel valves, dual redundant packing, oversized crankshaft bearings — factory-installed and factory-verified. Ready to mount.
• Gymatic C2 adjustable unloader with banjo bolts and sealing O-rings — factory-matched and factory-installed for the 4.0 GPM / 3,700 PSI duty point. Smooth pressure regulation and safe bypass from first startup. Already on it.
• Garden hose adapter — thread a standard garden hose directly to the inlet. Water supply connected. No additional inlet fittings required. The RKV4G37-PKG is ready to prime the moment installation is complete.
• Stainless steel inlet water filter — factory-included inline filter protects ceramic plungers, stainless valves, and dual redundant packing from particulate contamination in the supply line. This is the component that extends pump service life from day one — and it ships in the box.
• Thermal relief valve — factory-installed protection against pump head overheating during extended bypass periods.
• Hardware and fittings for engine and frame integration — every fitting and fastener required for installation onto contractor skids, fleet wash frames, flatbed rigs, and OEM installations. Organized in the box. Nothing to source separately.
• Chemical injector and suction hose — not included — the RKV4G37-PKG delivers straight 3,700 PSI high-pressure water output. When detergent capability is required, a downstream chemical injector and suction assembly are sourced separately. Choose the draw rate and connection style that matches your cleaning program.
• Factory break-in oil — crankcase pre-filled. First-startup protection already handled.
• Oil sight glass and vented dipstick — at-a-glance oil monitoring from day one.
• Installation and maintenance manual with parts schematics — complete setup, operating, service, and rebuild procedures with Annovi Reverberi part numbers for every component. AR North America parts availability confirmed nationally.

Decoding the RKV4G37-PKG

What This Annovi Reverberi Pump Package Designation Tells You

• RKV — Pump series: RKV Series heavy-duty triplex plunger pump — Annovi Reverberi’s professional commercial and industrial gas engine platform
• 4G — Pump series identifier for this RKV configuration
• 37 — Maximum pressure: 3,700 PSI — 4.0 × 3,700 = 14,800 cleaning units
• PKG — Complete package: pump, Gymatic C2 unloader with banjo bolts, garden hose adapter, stainless inlet filter, thermal relief valve, hardware and fittings, manual, and factory break-in oil — everything required for a complete engine-to-pump installation in one organized box

Key Specifications

RKV4G37-PKG Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 3,700 PSI
• Cleaning Units: 14,800 (GPM × PSI)
• Operating Speed: 3,400 RPM — direct drive gas engine
• Pump Type: RKV Series triplex ceramic plunger pump
• Flange: F24 — SAE J609a, 1″ hollow keyway shaft, direct drive gas and diesel engine compatible (Annovi Reverberi part AR41866)
• Connecting Rods: Bronze — required specification for sustained 3,700 PSI continuous-duty operation
• Manifold: Forged brass — maximum corrosion and fatigue resistance under sustained high-pressure operation
• Plungers: Solid ceramic — wear resistance and thermal stability
• Valves: Stainless steel inlet and discharge — precise flow control and dependable sealing
• Packing: Dual redundant — extended seal longevity and increased time between rebuilds
• Volumetric Efficiency: Approximately 93% — cooler operation and stable performance
• Bearings: Oversized crankshaft — rotational stability and wear mitigation under continuous duty
• Lubrication: Vented oil-bath crankcase — continuous lubrication and temperature control
• Thermal Relief: Included — prevents overheating during extended bypass operation
• Garden Hose Adapter: Included — standard inlet connection, no additional fittings required
• Inlet Filter: Stainless steel — included; protects pump internals from supply line particulate contamination
• Unloader: Gymatic C2 — factory-matched, factory-installed, banjo bolts and O-rings included
• Chemical Injector: Not included — straight 3,700 PSI water output; downstream injector sourced separately
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

Engine Compatibility — What Drives the RKV4G37-PKG

F24 SAE J609a. 1″ Hollow Keyway Shaft. Predator-Compatible. Direct-Mount Ready.

• Harbor Freight Predator 420cc / 13 HP — the primary Predator pairing for the RKV4G37-PKG. Direct value-priced replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440. Compatible with the F24 1″ keyway shaft — the natural choice for contractors building Predator-powered mobile wash rigs and flatbed systems with the RKV4G37-PKG at 3,700 PSI.
• Harbor Freight Predator 459cc / 15.8 HP Max Performance — up to 10% more torque than the standard 420cc. Direct replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440. Compatible with the RKV4G37-PKG F24 1″ keyway shaft — the preferred single-cylinder Predator pairing for sustained high-pressure continuous-duty operation.
• Harbor Freight Predator 670cc / 22 HP V-Twin — for sustained 3,700 PSI continuous-duty operations on contractor flatbeds and fleet wash installations. Replaces Honda GX630/660/690 and Briggs & Stratton Vanguard at significant cost savings. Delivers engine overhead for extended daily duty cycles.
• Honda GX390 — 389cc, 1″ SAE J609a keyway shaft. Direct-mount compatible with the RKV4G37-PKG F24 flange.
• Briggs & Stratton XR2100 / Vanguard series — 1″ SAE keyway. Direct-mount compatible.
• Kohler CH440 / Command series — 1″ SAE keyway. Direct-mount compatible.
• Compatible diesel engines — any gas or diesel engine with a 1″ SAE J609a horizontal keyway shaft at 3,400 RPM is compatible with the RKV4G37-PKG F24 direct-drive flange.

Built for the Predator-Powered Contractor Rig

Garden Hose Ready. Filter Protected. Flatbed Proven. Maximum Output Per Dollar.

• Build your own system — own the savings and the quality — a Predator 420cc or 670cc paired with the RKV4G37-PKG delivers 14,800 cleaning units of professional output. The garden hose adapter and stainless inlet filter mean the rig is operational from the first connection — no parts run, no missing components, no delay.
• The inlet filter protects the investment — contractors who build their own systems on a flatbed or trailer often pull water from outdoor supply lines, tanks, or job site connections where sediment and debris are real variables. The stainless steel inlet filter that ships with the RKV4G37-PKG intercepts that contamination before it reaches the pump. No filter means accelerated plunger and valve wear. The filter is already in the box.
• Standardize your flatbed for maximum uptime — contractors running multiple identical Predator/RKV4G37-PKG stations gain standardized parts, standardized procedures, and standardized performance. Every station uses the same filter, the same adapter, the same rebuild kit.
• AR North America national parts network — every wear component in the RKV4G37-PKG is stocked nationally. Rebuild kits, packing kits, valve assemblies, C2 unloader service parts, replacement filter screens — one call. The rig keeps running.

Typical Applications

Where the RKV4G37-PKG Delivers Best Results

• Contractor systems — skid and trailer rigs for building wash, surface prep, and equipment cleaning — the RKV4G37-PKG’s complete inlet package and 3,700 PSI output give contractors a drop-in-ready high-pressure solution with garden hose connection and supply line filtration built in
• Fleet maintenance — transit fleets, trucking operations, and commercial vehicles — dedicated wash bays where consistent 3,700 PSI output and a complete inlet package support reliable daily fleet cleaning programs
• Agricultural operations — barn sanitation, tractor washdown, and irrigation system maintenance where the RKV4G37-PKG’s complete package and bronze rod continuous-duty construction handle demanding agricultural programs
• Industrial plant cleaning — conveyor cleaning, process equipment washdown, and general facility cleaning where 14,800 cleaning unit output and sustained 3,700 PSI performance meet industrial washdown demands
• Food and beverage production — sanitation tasks when used with approved chemicals and appropriate compliance procedures, with chemical delivery sourced separately
• Municipal maintenance — public works fleets, street furniture, garages, and utility facilities where standardized, rebuildable pump packages support scheduled cleaning programs

5-Year US Warranty, National Parts Availability, and Wholesale Pricing

Built in Italy. Distributed Across North America. Garden Hose Ready. Backed for Five Years.

The RKV4G37-PKG is protected by Annovi Reverberi’s 5-year limited warranty through the US-based warranty and service network administered by AR North America. Every internal wear component — ceramic plungers, bronze connecting rods, forged brass manifold seals and o-rings, stainless valve seats, Gymatic C2 unloader service parts, dual redundant packing kits, replacement inlet filter screens, and oversized crankcase bearings — is stocked nationally through authorized AR North America distribution channels. Contractors, fleet operators, agricultural operations, industrial facility managers, OEM equipment builders, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RKV4G37-PKG and the complete WSHPWR pump package lineup. WSHPWR maintains one of the most complete Annovi Reverberi inventories available through any US web store — with thousands of products in stock and a continually expanding catalog.

14,800 Cleaning Units. 3,700 PSI. 4.0 GPM. Garden Hose Ready. Stainless Filter. Bronze Rods. F24 SAE J609a. Everything in One Box.

Italian Engineering. Predator-Compatible. Complete Inlet Package. 5-Year US Warranty.

Thread on the garden hose. Bolt on the engine. Connect the high-pressure hose. Start the engine. The RKV4G37-PKG is washing. Bronze connecting rods. Forged brass manifold. Dual redundant packing. 93% volumetric efficiency. Gymatic C2 unloader. Stainless steel inlet filter. Garden hose adapter. Thermal relief valve. Every fitting and every bolt. Factory-tested. Pre-lubricated. Five-year US warranty. One box. Same-day install.

Volume buyers and contractors building multi-unit systems can reach the WSHPWR wholesale team directly at wholesale@wshpwr.com to discuss pricing across the complete Annovi Reverberi pump package lineup.