RTR-RKV4G37 Ready-to-Run Pump Kit | RKV4G37D-F24VR35

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

The RTR-RKV4G37 by Annovi Reverberi is a factory operationally tested, pressure-set Ready-to-Run pump kit engineered for direct drive gas engine-powered pressure washing systems requiring 4.0 GPM at 3,700 PSI with zero commissioning at installation. Rated at 4.0 GPM and 3,700 PSI, the RTR-RKV4G37 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 fittings that make system connections immediate. The Annovi Reverberi factory service department has already run this pump, set the pressure, and verified performance before shipment. Mount it to the engine. Connect the quick-connect fittings. Start the engine. The system is operational. As part of Annovi Reverberi’s pump and unloader assemblies stocked and supported by WSHPWR, the RTR-RKV4G37 is the field-proven answer for operators who need 3,700 PSI ready to run from the first startup.

The RTR-RKV4G37 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. For contractors replacing a pump on a job site, fleet operators bringing a wash bay back online, or system builders who want professional-grade performance without commissioning time — the RTR-RKV4G37 delivers. Protected by a 5-year US limited warranty and built to be fully rebuilt rather than replaced, this is a decade-of-service investment that starts earning the moment it is installed.

RTR — Ready to Run: Factory Tested, Pressure-Set, Zero Field Calibration

Operationally Tested. Pressure-Set at 3,700 PSI. VR35 Calibrated. Bolt On and Wash.

• Factory operationally tested under load — every RTR-RKV4G37 is run under operating conditions by Annovi Reverberi’s factory service department before shipment. Flow, pressure, bypass behavior, and seal integrity are verified under actual working conditions. The pump has already been run before it reaches your hands.
• Pressure-set at 3,700 PSI and locked — working pressure is factory-set and the VR35 unloader is calibrated and locked to specification. When the RTR-RKV4G37 is installed and the engine starts, it delivers 3,700 PSI from the first cycle. No adjustment knob. No pressure gauge at installation. No fine-tuning in the field.
• Zero field commissioning — for contractors replacing a pump under time pressure, fleet operators minimizing wash bay downtime, and service professionals who bill by the job — the RTR-RKV4G37 eliminates every startup variable. Installation is the whole job.
• Quick-connect fittings for immediate system connection — the RTR-RKV4G37 includes quick-connect fittings that allow fast, secure system plumbing connections without wrenches or thread tape for the fitting interfaces. System connection is as fast as the installation itself.

Everything in the Kit — RTR-RKV4G37 Contents

Factory-Tested. Pressure-Set. Quick-Connect Ready. Same-Day Operational.

• RKV4G37D-F24VR35 triplex ceramic plunger pump — RTR factory operationally tested — run under load, pressure-set at 3,700 PSI, and verified 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 and locked — Gymatic VR35 calibrated and locked to the 4.0 GPM / 3,700 PSI duty point as part of RTR operational testing. Smooth pressure regulation and safe bypass from the first cycle. No field adjustment required.
• Quick-connect fittings — for fast, secure system connections at installation. Compatible with standard commercial hose and fitting configurations.
• Thermal relief valve — factory-installed. Protects pump head from overheating during extended bypass periods.
• Chemical injector and suction hose — not included — the RTR-RKV4G37 delivers straight 3,700 PSI high-pressure water output. Downstream chemical delivery sourced separately when detergent capability is required.
• 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 component.

Decoding the RTR-RKV4G37

What 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. 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

RTR-RKV4G37 Family — Standard Kit vs Complete Kit

Both models are factory operationally tested, pressure-set, and include the VR35 unloader, thermal relief valve, and quick-connect fittings. The difference is one addition:

• RTR-RKV4G37 (this model) — factory-preset RTR kit with VR35 unloader, thermal relief valve, quick-connect fittings, oil, and manual. The standard Ready-to-Run specification for contractors and service professionals who supply their own hoses and prefer to specify their own hose configuration.
• RTR-RKV4G37-C — everything in the RTR-RKV4G37 plus quick-connect hoses included. The C complete kit for operators who want every component in the box — hoses included, nothing to source.

Key Specifications

RTR-RKV4G37 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 pressure fatigue resistance
• Plungers: Solid ceramic — thermal resistance and wear resistance
• Valves: Stainless steel inlet and discharge — consistent sealing and long service life
• 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
• Fittings: Quick-connect fittings included
• 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

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

• Harbor Freight Predator 420cc / 13 HP — the primary Predator pairing for the RTR-RKV4G37. Direct value-priced replacement for Honda GX390, Briggs & Stratton XR2100, and Kohler CH440. Compatible with the F24 1″ keyway shaft — the preferred contractor choice for Predator-powered rigs where the RTR-RKV4G37’s factory-set calibration eliminates commissioning on replacement installations.
• 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 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 flatbed and fleet wash applications. Replaces Honda GX630/660/690 and Briggs & Stratton Vanguard at significant savings. RTR pre-calibration means no commissioning delay on Predator-powered multi-unit rigs.
• Honda GX390 — 1″ SAE J609a keyway shaft. Direct-mount compatible with the RTR-RKV4G37 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 Is Built For

Field Service. Fast Replacement. Professional Performance. Zero Commissioning Time.

• Field service contractors replacing a pump under time pressure — the RTR factory calibration eliminates commissioning. The quick-connect fittings speed up system plumbing. The contractor arrives with an RTR-RKV4G37, bolts it on, connects the fittings, and the system is operational. No wasted time calibrating pressure at a customer’s job site.
• Fleet operators minimizing wash bay downtime — when a pump fails in a fleet wash bay, every hour offline affects vehicle availability. The RTR-RKV4G37’s factory-set pressure and quick-connect fittings return the bay to operation in the minimum possible time.
• Contractors and residential users who supply their own hoses — operators who already have compatible hoses or prefer to specify their own hose configuration get the full RTR-RKV4G37 quick-connect fitting set without paying for hoses they do not need. The RTR-RKV4G37-C adds hoses for those who want everything in the box.
• OEM service replacement programs — the RTR-RKV4G37’s pre-calibrated specification makes it the correct unit for field service technicians replacing pumps in OEM-built systems without on-site calibration equipment.

Typical Applications

Where the RTR-RKV4G37 Delivers Best Results

• Residential cleaning — driveways, siding, decks, patios, and fencing where the RTR-RKV4G37’s factory-set 3,700 PSI output and quick-connect fittings deliver professional cleaning results with minimum installation complexity
• Vehicle washing — cars, trucks, equipment, boats, and RVs where fast installation and factory-calibrated performance support efficient vehicle washing operations
• Commercial cleaning — storefronts, sidewalks, service stations, and warehouses where consistent 3,700 PSI output and RTR pre-calibration support reliable commercial cleaning programs
• Contractor construction sites and maintenance work — the RTR factory calibration eliminates commissioning downtime on active job sites where equipment needs to be operational immediately
• Industrial cleaning — machinery, shop floors, and wash bays where the RTR-RKV4G37’s pre-set pressure and quick-connect fittings support fast system deployment

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

Factory-Tested. Pressure-Set. Backed for Five Years. Parts Available Nationally.

The RTR-RKV4G37 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, service operations, property managers, OEM equipment builders, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RTR-RKV4G37 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. VR35 Preset. Quick-Connect Fittings. Bolt On and Wash.

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

When the pump fails and the job cannot wait — the RTR-RKV4G37 is the answer. Factory operationally tested. Pressure-set at 3,700 PSI. VR35 unloader calibrated and locked. Quick-connect fittings included. Bronze connecting rods. Forged brass manifold. Thermal relief valve. Pre-lubricated. Five-year US warranty. One box. Mount it. Connect the fittings. Start the engine. The system is operational.

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