RTR-RKV4G37-C Complete Pump Kit | RKV4G37

RTR-RKV4G37-C by Annovi Reverberi — Ready to Run Complete Kit | 4.0 GPM | 3,700 PSI | Bronze Connecting Rods | Forged Brass Manifold | VR35 Unloader | Quick-Connect Hoses and Fittings | F24 SAE J609a 1″ Shaft | Factory Operationally Tested | 14,800 Cleaning Units

The RTR-RKV4G37-C by Annovi Reverberi is a factory operationally tested, pressure-set, complete Ready-to-Run kit engineered for immediate installation on 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 RTR-RKV4G37-C delivers 14,800 cleaning units — through bronze connecting rods, solid ceramic plungers, a forged brass manifold, stainless steel valves, a factory-preset VR35 unloader, thermal relief valve, and quick-connect hoses and fittings that make the water supply and system connections as simple as plugging in. The RTR designation means the factory service department has already run this pump, set the pressure, and verified performance before shipment. The C designation means the kit is complete — hoses, fittings, unloader, thermal relief, oil, and manual are all in the box. Mount it. Connect the hoses. Start the engine. Wash. As part of Annovi Reverberi’s pump and unloader assemblies stocked and supported by WSHPWR, the RTR-RKV4G37-C is the most complete, most installation-ready pump kit in the lineup.

The RTR-RKV4G37-C bridges two buyer worlds that other packages serve separately. For the contractor or fleet operator replacing a pump under time pressure, the RTR factory calibration eliminates commissioning. For the residential user, property manager, or first-time system builder who wants professional-grade performance without engineering the installation from scratch, the C complete kit provides everything needed for a successful same-day install. Built by Annovi Reverberi in Modena, Italy and backed by a 5-year US limited warranty — this is a decade-of-service investment that starts earning from the first pull of the cord.

RTR + C — What Both Designations Mean and Why They Matter Together

Factory-Tested. Pressure-Set. Complete Kit. Nothing Missing. Nothing to Adjust.

The RTR-RKV4G37-C combines two separate value propositions in a single kit — and understanding both is the key to knowing why this is the right choice:

• RTR — Ready to Run: every RTR-RKV4G37-C is factory operationally tested under load by Annovi Reverberi’s factory service department before shipment. Working pressure is set to 3,700 PSI and locked. Bypass and VR35 unloader behavior are calibrated and verified. The pump arrives having already been run — no startup calibration, no pressure adjustment, no fine-tuning in the field. Install it and it works to specification from the first cycle.
• C — Complete Kit: beyond the RTR operational testing, the C designation confirms this kit includes quick-connect hoses and fittings that make system connections immediate. Thread on the hose, connect the quick-connect fittings, start the engine — the RTR-RKV4G37-C is operational. No separate hose sourcing. No compatible fitting research. No additional trips to the parts counter.
• Together — the fastest path from box to operational: the RTR-RKV4G37-C is the only kit in the WSHPWR Annovi Reverberi lineup that combines factory operational testing, factory pressure setting, and a complete quick-connect hose and fitting package in a single box. For operators who measure installation success in hours, not days, this is the specification that delivers.

Everything in the Box — The RTR-RKV4G37-C Complete Kit Contents

Pressure-Set. Hoses Included. Quick-Connect Fittings Included. Same-Day Operational.

Open the RTR-RKV4G37-C box and find a complete, factory-calibrated, hose-ready installation:

• RKV4G37 triplex ceramic plunger pump — RTR factory operationally tested — run under load, pressure-set at 3,700 PSI, and verified at the factory before shipment. Bronze connecting rods, solid ceramic plungers, forged brass manifold, stainless steel valves — factory-installed and factory-confirmed operational. Ready to mount.
• VR35 unloader — factory preset — the Gymatic VR35 is factory-preset to the 4.0 GPM / 3,700 PSI duty point and locked as part of the RTR operational testing process. Smooth pressure regulation and safe bypass from the first cycle. No field adjustment required.
• Quick-connect hoses and fittings — the C designation’s defining contents. Quick-connect hoses and compatible fittings allow immediate system connection without sourcing additional plumbing components. Connect the water supply. Connect the high-pressure outlet. The RTR-RKV4G37-C is ready to run.
• Thermal relief valve — factory-installed protection against pump head overheating during extended bypass periods. Protects ceramic plungers and packing from heat damage during operator pause intervals.
• Chemical injector and suction hose — not included — the RTR-RKV4G37-C delivers straight 3,700 PSI high-pressure water output. When detergent capability is required, a downstream chemical injector and suction assembly are sourced separately.
• Factory break-in oil — pre-filled. Startup lubrication protection already handled.
• Instruction manual and schematic diagrams — complete setup, operating, service, and rebuild procedures with Annovi Reverberi part numbers for every serviceable component.

Decoding the RTR-RKV4G37-C

What Every Segment of This Annovi Reverberi Kit Designation Tells You

• RTR — Ready to Run: factory operationally tested, pressure-set at 3,700 PSI, bypass calibrated and verified by Annovi Reverberi’s factory service department before shipment. No field commissioning required.
• 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
• C — Complete kit: quick-connect hoses and fittings included in addition to the full RTR pump and unloader assembly — the most complete installation package in the RTR lineup

Key Specifications

RTR-RKV4G37-C 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 engine compatible (Annovi Reverberi part AR41866)
• Connecting Rods: Bronze — required specification for sustained 3,700 PSI continuous-duty operation
• Manifold: Forged brass — corrosion resistance and fatigue resistance under sustained high-pressure operation
• Plungers: Solid ceramic — thermal resistance and wear resistance
• Valves: Stainless steel inlet and discharge — consistent sealing and dependable flow
• Unloader: VR35 Gymatic — factory-preset and locked at 3,700 PSI as part of RTR operational testing
• Thermal Relief: Included — factory-installed protection during extended bypass
• Hoses and Fittings: Quick-connect hoses and fittings included — C kit designation
• Pre-Shipment Status: RTR — factory operationally tested, pressure-set, and verified
• Chemical Injector: Not included — straight 3,700 PSI water output
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

Engine Compatibility — What Drives the RTR-RKV4G37-C

F24 SAE J609a. 1″ Hollow Keyway Shaft. Predator-Compatible. Broad Engine Range.

• Harbor Freight Predator 420cc / 13 HP — the primary Predator pairing for the RTR-RKV4G37-C at 3,700 PSI. Direct value-priced replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440. Compatible with the F24 1″ keyway shaft — the natural contractor choice for Predator-powered rigs and replacement installations where the RTR-RKV4G37-C’s pre-set calibration eliminates commissioning time.
• 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 RTR-RKV4G37-C 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 — preferred for sustained 3,700 PSI continuous-duty applications. Replaces Honda GX630/660/690 and Briggs & Stratton Vanguard at significant savings. The RTR-RKV4G37-C’s factory-set calibration makes it the ideal drop-in replacement for Predator-powered flatbed and fleet wash systems requiring no commissioning downtime.
• Honda GX390 — 1″ SAE J609a keyway shaft. Direct-mount compatible with the RTR-RKV4G37-C F24 flange.
• Briggs & Stratton XR2100 / Vanguard series — 1″ SAE keyway. Direct-mount compatible.
• Kohler CH440 / Command series — 1″ SAE keyway. Direct-mount compatible.

Who the RTR-RKV4G37-C Is Built For

Contractors. Property Managers. Homeowners. Anyone Who Wants Professional Results Without the Setup.

• Field service contractors replacing a pump under time pressure — the RTR factory calibration eliminates commissioning. The quick-connect hoses eliminate plumbing sourcing. The contractor arrives with an RTR-RKV4G37-C, bolts it on, connects the quick-connects, and the system is operational. No wasted time on a job site or in a customer’s wash bay.
• Property managers and facility maintenance teams — the RTR-RKV4G37-C’s plug-and-play quick-connect design and factory-set pressure make it practical for maintenance teams who need a reliable high-pressure cleaning system without in-house technical expertise for pump commissioning.
• Residential users and homeowners — 3,700 PSI at 4.0 GPM is serious professional cleaning power for driveways, siding, vehicles, decks, and outdoor surfaces. The RTR-RKV4G37-C’s complete kit format and quick-connect connections make that power accessible without a contractor background — mount it to a compatible engine and it runs to specification from startup.
• OEM builders and integrators needing zero-commissioning replacement units — the RTR-RKV4G37-C ships with pressure already set, making it the correct specification for OEM service replacement programs where field technicians need a drop-in unit that requires no calibration on-site.

Typical Applications

Where the RTR-RKV4G37-C Delivers Best Results

• Residential cleaning — driveways, siding, patios, decks, and fencing where the RTR-RKV4G37-C’s complete quick-connect kit and factory-set 3,700 PSI output deliver professional cleaning results with residential-accessible installation
• Vehicle washing — cars, RVs, trucks, boats, and trailers where the RTR-RKV4G37-C’s complete kit format makes setup as straightforward as connecting a garden hose and a high-pressure outlet
• Commercial use — storefronts, sidewalks, service stations, and warehouses where consistent 3,700 PSI output and factory-set calibration support reliable commercial cleaning performance
• Contractor mobile wash units and construction cleanup — the RTR factory calibration eliminates commissioning downtime on contractor rigs and job sites where the clock runs from the moment the equipment arrives
• Industrial cleaning — machinery, shop floors, and wash bays where the RTR-RKV4G37-C’s pre-set pressure and complete quick-connect package support fast system deployment in industrial environments

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

Factory-Tested. Complete Kit. Backed for Five Years. Parts Available Nationally.

The RTR-RKV4G37-C 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, VR35 unloader service parts, packing kits, and crankcase bearings — is stocked nationally through authorized AR North America distribution channels. Contractors, fleet operators, property managers, OEM equipment builders, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RTR-RKV4G37-C 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. RTR Factory-Set. Complete Kit. Quick-Connect Hoses. VR35 Unloader. Bolt On and Wash.

Italian Engineering. Ready to Run. Complete Kit. Factory Operationally Tested. 5-Year US Warranty.

The RTR-RKV4G37-C is the most complete pump kit in the Annovi Reverberi lineup. Factory operationally tested. Pressure-set at 3,700 PSI. Quick-connect hoses and fittings in the box. VR35 unloader factory-preset. Thermal relief valve installed. Bronze connecting rods. Forged brass manifold. Pre-lubricated. Five-year US warranty. Mount it. Connect the quick-connects. Start the engine. The system is operational.

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