RKV4G37-VRT-PKG | 4.0 GPM 3700 PSI Triplex Pump, VRT Unloader

RKV4G37-VRT-PKG by Annovi Reverberi — Complete VRT Plumbed RK Series Triplex Plunger Pump Package | 4.0 GPM | 3,700 PSI | Bronze Connecting Rods | Forged Brass Manifold | F24 SAE J609a 1″ Shaft | VRT Unloader with Easy Start | Auto-Reset Thermal Relief | 14,800 Cleaning Units

The RKV4G37-VRT-PKG by Annovi Reverberi is a complete, factory-assembled VRT plumbed RK Series triplex plunger pump package engineered for direct drive gas engine-powered pressure washing systems requiring 4.0 GPM at 3,700 PSI with fully integrated VRT pressure management, Easy Start, and automatic thermal protection. Rated at 4.0 GPM and 3,700 PSI, the RKV4G37-VRT-PKG delivers 14,800 cleaning units — through bronze connecting rods, solid ceramic plungers, a forged brass manifold, stainless steel valves, dual redundant packing, oversized crankshaft bearings, and an F24 SAE J609a 1″ hollow keyway shaft for direct coupling to compatible gasoline engines. As part of Annovi Reverberi’s pump and unloader assemblies stocked and supported by WSHPWR, the RKV4G37-VRT-PKG is the complete answer for contractors, OEM builders, and professional operators who need 3,700 PSI with factory-integrated VRT pressure management and the full protection suite in one organized box. Protected by a 5-year US limited warranty. Fully rebuildable.

Everything in One Box — The RKV4G37-VRT-PKG Complete VRT Plumbed Package

Factory-Plumbed. Factory-Tested. Gas Engine Ready. Nothing Left to Source.

• RKV4G37 triplex 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. F24 SAE J609a 1″ hollow keyway shaft for direct gas engine coupling. Ready to mount.
• VRT adjustable unloader — factory-plumbed and pressure-set — factory-calibrated for the 4.0 GPM / 3,700 PSI duty point. Smooth pressure regulation and controlled bypass from the first startup.
• Easy Start feature — at engine startup, the VRT bypass circuit opens and the pump starts against zero back pressure. The engine engages freely under no hydraulic load. Once the engine reaches operating speed, the bypass closes and the system builds to 3,700 PSI. Easier starts. Less starter stress. Longer engine life.
• Exterior bypass recirculation loop — factory-plumbed — bypass circuit factory-assembled and connected. Controlled water flow during trigger shut-off intervals, protecting the pump from pressure spikes throughout the cleaning cycle.
• Automatic Thermal Relief Valve (TRV) — factory-installed — thermal sensing pill monitors bypass water temperature continuously. When bypass water reaches 124–145°F, the TRV opens — hot water exits, ambient supply water flows in to replace it. Auto-closes when temperature normalizes. No manual reset.
• Chemical injector and suction hose — not included — the RKV4G37-VRT-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.
• Mounting hardware and fittings — every fastener and fitting for integration onto contractor skids, portable rigs, and OEM installations. Organized in the box.
• Factory break-in oil — crankcase pre-filled. Oil sight glass and vented dipstick for ongoing monitoring.
• Operator’s manual and service schematics — complete installation, operating, service, and rebuild procedures with Annovi Reverberi part numbers for every serviceable component. AR North America parts availability confirmed nationwide.

Decoding the RKV4G37-VRT-PKG

What This Annovi Reverberi Package Designation Tells You

• RKV — Pump series: RK Series triplex plunger pump — Annovi Reverberi’s professional commercial gas engine platform
• 4G — Pump series identifier: 4.0 GPM flow rate
• 37 — Maximum pressure: 3,700 PSI — 4.0 × 3,700 = 14,800 cleaning units
• VRT — Unloader family: VRT Series adjustable unloader — factory-plumbed with Easy Start, bypass recirculation loop, and auto-reset TRV thermal protection
• PKG — Complete VRT plumbed package: pump plus fully integrated VRT plumbing assembly — everything in one factory-assembled, factory-tested box

Key Specifications

RKV4G37-VRT-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)
• Pump Type: RK Series triplex plunger pump — smooth, low-pulsation output; approximately 93% volumetric efficiency
• Shaft: F24 — SAE J609a, 1″ hollow keyway, direct drive gas engine compatible
• Connecting Rods: Bronze — required specification at 3,700 PSI for sustained continuous-duty operation
• Manifold: Forged brass — pressure stability and corrosion resistance
• Plungers: Solid ceramic — wear resistance and consistent performance
• Valves: Stainless steel inlet and discharge
• Packing: Dual redundant — extended seal life
• Bearings: Oversized crankshaft — load management and service life
• Unloader System: VRT — factory-plumbed, pressure-set, and verified
• Easy Start: Bypass-circuit zero-back-pressure startup
• Thermal Relief Valve: Auto-open/auto-reset at 124–145°F — no manual reset
• Chemical Injector: Not included — straight 3,700 PSI water output; sourced separately
• Lubrication: Vented oil-bath crankcase; pre-filled break-in oil; sight glass and vented dipstick
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

Engine Compatibility — What Drives the RKV4G37-VRT-PKG

F24 SAE J609a. 1″ Hollow Keyway Shaft. Predator and Honda Compatible.

• Harbor Freight Predator 459cc / 15.8 HP Max Performance — the preferred single-cylinder Predator pairing for the RKV4G37-VRT-PKG. Up to 10% more torque than the standard 420cc. Direct replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440. Compatible with the RKV4G37-VRT-PKG F24 1″ keyway shaft — the right choice for sustained 3,700 PSI continuous-duty operation.
• Harbor Freight Predator 420cc / 13 HP — compatible with the RKV4G37-VRT-PKG F24 1″ keyway shaft. Direct value-priced replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440.
• Harbor Freight Predator 670cc / 22 HP V-Twin — for operators requiring maximum engine overhead on sustained continuous-duty contractor programs at 3,700 PSI. Replaces Honda GX630/660/690 and Briggs & Stratton Vanguard at significant cost savings.
• Honda GX390 — 389cc, 1″ SAE J609a keyway shaft. The benchmark commercial pressure washer engine. Direct-mount compatible with the RKV4G37-VRT-PKG F24 flange.
• Briggs & Stratton XR2100 / Vanguard series — 1″ SAE keyway. Direct-mount compatible.
• Kohler CH440 / Command series — 1″ SAE keyway. Direct-mount compatible.

Typical Applications

Where the RKV4G37-VRT-PKG Delivers Best Results

• Contractor mobile wash rigs — surface prep, concrete cleaning, and equipment washdown — the RKV4G37-VRT-PKG’s 4.0 GPM / 3,700 PSI output with factory-plumbed VRT management and Easy Start delivers professional contractor cleaning performance with zero commissioning at installation
• Fleet wash systems and facility cleaning — 14,800 cleaning units with automatic TRV protection and VRT bypass management support high-cycle daily fleet washing programs with minimal operator intervention
• Agricultural barn sanitation and equipment washdown — bronze connecting rods, forged brass manifold, and dual redundant packing support demanding agricultural cleaning programs across full seasonal duty cycles
• OEM equipment builds requiring 3,700 PSI VRT specification — complete factory-plumbed package standardizes builds for OEM builders with F24 1″ shaft gas engine compatibility across all standard engine platforms

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

Triplex Plunger. VRT Plumbed. Bronze Rods. Backed for Five Years.

The RKV4G37-VRT-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, stainless valve seats, VRT unloader service parts, and dual redundant packing kits — is stocked nationally through authorized AR North America distribution channels. Contractors, OEM builders, fleet operators, agricultural operations, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RKV4G37-VRT-PKG and the complete WSHPWR pump package lineup.

14,800 Cleaning Units. 3,700 PSI. 4.0 GPM. VRT Plumbed. Easy Start. Auto-Reset TRV. Bronze Rods. F24 1″ Shaft. Everything in One Box.

Annovi Reverberi RK Series. Triplex Plunger. VRT Plumbed. 5-Year US Warranty.

The RKV4G37-VRT-PKG is the complete Annovi Reverberi VRT plumbed package for contractors and OEM builders who need 4.0 GPM at 3,700 PSI with factory-integrated pressure management and full thermal protection. Bronze connecting rods. Forged brass manifold. Dual redundant packing. VRT unloader factory-plumbed. Easy Start. Automatic thermal relief. Every fastener and fitting. Factory-tested. Pre-lubricated. Five-year US warranty. One box. Same-day install.

Volume buyers can reach the WSHPWR wholesale team directly at wholesale@wshpwr.com to discuss pricing across the complete Annovi Reverberi pump package lineup.