RKA4G40HNL-VR35 Triplex Pump | 4.0 GPM 4000 PSI

RKA4G40HNL-VR35 by Annovi Reverberi — Industrial Triplex Plunger Pump with Gymatic VR35 Unloader | 4.0 GPM | 4,000 PSI | Nickel Plated Brass Head | 45mm Extended Solid Shaft | V-Belt and Poly-Drive Compatible | 1,750 RPM Electric Motor Platform

The RKA4G40HNL-VR35 by Annovi Reverberi is a heavy-duty industrial triplex ceramic plunger pump engineered for electric motor-driven commercial and industrial pressure washing systems requiring 4.0 GPM at 4,000 PSI with Gymatic VR35 bypass regulation and a 45mm extended solid shaft specifically designed for v-belt and poly-drive belt coupling applications. Rated at 4.0 GPM and 4,000 PSI at 1,750 RPM, the RKA4G40HNL-VR35 delivers 16,000 cleaning units — combining 4.0 GPM high-volume output with maximum 4,000 PSI penetrating impact for industrial surfaces, fleet vehicles, production equipment, and facility cleaning — through a nickel plated brass head, solid ceramic plungers, stainless steel valves, and oversized heavy-duty bearings on a low-speed electric motor platform purpose-built for continuous industrial duty cycles.

The RKA4G40HNL-VR35 addresses a specific installation requirement: applications where a standard-length solid shaft is insufficient for v-belt pulley, poly-drive belt, or flexible coupling configurations. The L designation confirms the 45mm extended solid shaft — Annovi Reverberi’s purpose-built solution for belt-coupled industrial pressure washer systems, electric motor wash skids, and stationary facility cleaning installations where the extended shaft length provides the pulley engagement depth and belt alignment geometry required for reliable power transmission. Operating at 1,750 RPM, the RKA4G40HNL-VR35 runs significantly cooler and quieter than high-speed gas engine platforms, reducing internal component stress and extending bearing, seal, and plunger service intervals across industrial continuous-duty environments.

Built by Annovi Reverberi in Modena, Italy — with US-based operations, a domestic parts distribution network, and dedicated technical support — this pump arrives pre-filled with factory break-in oil, equipped with the factory-matched VR35 Gymatic unloader, and packaged with operator’s manual and full parts schematic. Protected by a 5-year US limited warranty and built to be fully rebuilt rather than replaced, the RKA4G40HNL-VR35 is a long-term industrial investment capable of a decade of productive service life.

Factory-Matched and Approved — The RKA4G40HNL-VR35 Complete Assembly Advantage

No Mismatches. No Guesswork. No Warranty Risk. Just Install and Run.

Every RKA4G40HNL-VR35 ships as a factory-matched, factory-approved, and factory-installed complete pump and unloader assembly:

• Factory-matched VR35 for 4,000 PSI — the Gymatic VR35 unloader is factory-calibrated for this pump’s 4.0 GPM / 4,000 PSI operating point. The VR35 is rated to 4,000 PSI and 5 GPM — operating at its rated ceiling on the RKA4G40HNL-VR35 with a stable, factory-set bypass response.
• Factory-approved configuration — the complete assembly is Annovi Reverberi’s validated specification for this model. Operating with the factory-installed components maintains full 5-year warranty coverage.
• Factory-installed and tested — every RKA4G40HNL-VR35 exits the manufacturing facility with the VR35 unloader mounted, calibrated, and tested for flow, pressure, and leak-free operation before shipment.
• Eliminates mismatch returns — incorrect unloader specification is the most common source of industrial pump system returns. The factory-matched assembly eliminates this before the pump leaves the box.
• Installation-ready — connect to the electric motor via belt coupling, connect system hoses, and start. The RKA4G40HNL-VR35 arrives engineered, assembled, and ready.

Decoding the RKA4G40HNL-VR35 Model Number

What Every Segment of This Annovi Reverberi Pump Designation Tells You

• RKA — Pump series: RKA Series industrial triplex plunger pump — Annovi Reverberi’s heavy-duty electric motor platform
• 4G — Flow rate: 4.0 GPM
• 40 — Maximum pressure: 4,000 PSI — 4.0 × 4,000 = 16,000 cleaning units
• H — Pump head specification: Nickel Plated Brass Head — nickel plating on the brass pump head provides enhanced corrosion resistance and surface hardness on the manifold surfaces
• N — Shaft type: Natural / Solid Shaft — precision-machined solid shaft per Annovi Reverberi model designation convention
• L — Shaft length: 45mm Extended Solid Shaft — Annovi Reverberi’s purpose-built extended shaft specification for v-belt pulley, poly-drive belt, and flexible coupling installations requiring additional engagement depth beyond the standard shaft length
• VR35 — Unloader system: Gymatic VR35 — rated to 4,000 PSI and 5 GPM; factory-matched and factory-installed for this pump’s 4.0 GPM / 4,000 PSI operating point

Key Specifications

RKA4G40HNL-VR35 Technical Details at a Glance

• Flow Rate: 4.0 GPM (gallons per minute)
• Maximum Pressure: 4,000 PSI
• Cleaning Units: 16,000 (GPM × PSI)
• Operating Speed: 1,750 RPM — low-speed electric motor platform for reduced heat, vibration, and component wear
• Pump Type: RKA Series industrial triplex ceramic plunger pump
• Pump Head: Nickel Plated Brass Head (H designation) — enhanced corrosion resistance and surface hardness on the brass head manifold surfaces
• Shaft Type: Natural solid shaft (N designation)
• Shaft Length: 45mm extended solid shaft (L designation) — for v-belt, poly-drive belt, and flexible coupling applications
• Connecting Rods: Bronze — premium fatigue strength and wear resistance at 4.0 GPM / 4,000 PSI continuous duty cycles
• Plungers: Solid ceramic — exceptional hardness, wear resistance, and thermal stability
• Pump Head Valves: Stainless steel — reliable intake and discharge control under continuous high-pressure cycling
• Bearings: Oversized heavy-duty — low-vibration operation and extended service intervals at 1,750 RPM industrial duty
• Serviceability: Oil sight glass and vented dipstick for simplified routine maintenance
• Lubrication: Oil-bath crankcase with factory pre-filled break-in oil
• Unloader System: Gymatic VR35 — rated 4,000 PSI / 5 GPM; factory-matched and factory-installed
• Chemical Injector: Not included — straight 4,000 PSI water output
• Warranty: 5-year limited warranty — US-based coverage through Annovi Reverberi North America

What’s Included in the Box

A Complete, Factory-Configured RKA4G40HNL-VR35 Assembly Ready for Installation

• Factory-matched Gymatic VR35 unloader — installed and calibrated for the 4.0 GPM / 4,000 PSI operating point
• 45mm extended solid shaft — ready for v-belt pulley, poly-drive belt, or flexible coupling installation
• Factory break-in oil — crankcase pre-filled to the correct operating level for first startup
• Oil sight glass and vented dipstick — at-a-glance oil level monitoring and simplified oil changes
• Operator’s manual — complete installation, startup, operating, and maintenance procedures
• Parts schematic — exploded-view diagram with Annovi Reverberi part numbers for every serviceable component

The 45mm Extended Solid Shaft — Purpose-Built for Belt-Coupled Industrial Systems

V-Belt. Poly-Drive. Flexible Coupling. The Right Shaft Length for Industrial Power Transmission.

The L designation on the RKA4G40HNL-VR35 solves a specific installation challenge that standard-length solid shaft pumps cannot address:

• Standard shaft length limitations in belt-coupled systems — many industrial pressure washer installations use v-belt or poly-drive belt coupling between an electric motor and pump rather than direct-drive mounting. Standard solid shaft lengths often provide insufficient engagement depth for proper pulley seating, belt alignment, and secure fastener retention under load.
• 45mm extended solid shaft — the L designation on the RKA4G40HNL-VR35 confirms the 45mm solid shaft length, providing the additional engagement depth required for v-belt pulleys, poly-drive belt systems, and flexible coupling configurations in industrial wash skid and stationary system builds
• Proper belt alignment geometry — the extended solid shaft length on the RKA4G40HNL-VR35 allows precise pulley positioning for correct belt tracking, reducing belt wear and preventing premature bearing load from belt tension misalignment
• Industrial skid and stationary system applications — the RKA4G40HNL-VR35’s extended solid shaft and 1,750 RPM electric motor speed make it the correct specification for fixed industrial wash bays, production facility cleaning systems, and belt-driven pressure washer skids where long-term continuous operation is the standard duty cycle

1,750 RPM Low-Speed Electric Platform — Industrial Continuous Duty

Cooler. Quieter. Longer Service Intervals. Built for Industrial Environments.

• 1,750 RPM operating speed — the RKA4G40HNL-VR35 operates at less than half the speed of standard 3,400 RPM gas engine-driven pumps, producing significantly less heat, vibration, and internal component stress across continuous industrial duty cycles
• Extended bearing and seal life — lower rotational speed reduces centrifugal and reciprocating loads on bearings, packing seals, and plunger surfaces, extending rebuild intervals and reducing total maintenance cost per operating hour on the RKA4G40HNL-VR35
• Oversized heavy-duty bearings — engineered for sustained 4,000 PSI operation at 1,750 RPM, distributing combined radial and axial loads across a larger contact surface for long-term industrial reliability
• Reduced facility noise levels — 1,750 RPM electric operation produces substantially lower acoustic output than high-speed gas engine alternatives — relevant for indoor wash bays, food processing facilities, and enclosed industrial environments
• Consistent voltage-regulated speed — electric motor power provides stable, consistent RPM unaffected by fuel quality, ambient temperature, or altitude — ensuring predictable 4.0 GPM output and stable 4,000 PSI performance on the RKA4G40HNL-VR35 across all operating conditions

Nickel Plated Brass Head — Corrosion Resistance for Industrial Environments

• Nickel plating on forged brass head — the H designation on the RKA4G40HNL-VR35 confirms the nickel plated brass pump head. Nickel plating provides enhanced surface hardness and corrosion resistance beyond standard brass construction — critical in humid wash bays, detergent-heavy environments, and sanitation zones where chemical exposure is continuous
• Food processing and sanitation applications — the RKA4G40HNL-VR35’s nickel plated brass head, electric operation, and stainless steel valves make it particularly well suited for food processing plant sanitation zones and washdown areas where corrosion resistance standards are strictly enforced
• Thermal stability across extended run times — the brass head construction dissipates heat effectively during continuous 4,000 PSI industrial operation, maintaining consistent sealing surface geometry and valve seat integrity

Typical Applications

Where the RKA4G40HNL-VR35 Delivers Best Results

• Industrial belt-coupled wash skid systems — fixed and semi-portable industrial pressure washer installations where v-belt or poly-drive coupling between electric motor and pump requires the RKA4G40HNL-VR35’s 45mm extended solid shaft for correct pulley engagement and belt alignment
• Contractor mobile wash trailers and fleet cleaning setups — electric-powered trailer systems where 4.0 GPM at 4,000 PSI and consistent voltage-regulated output support production cleaning across fleet vehicles and equipment
• Industrial maintenance of machinery, floors, and equipment surfaces — the RKA4G40HNL-VR35’s 16,000 cleaning units and continuous-duty 1,750 RPM electric platform handle industrial contamination in production environments
• Food processing plant sanitation zones — nickel plated brass head and electric operation support the corrosion resistance and noise requirements of food-grade washdown environments
• Parking structures, ramps, and concrete surface cleaning — 4.0 GPM and 4,000 PSI provide the volume and impact needed for efficient large-area concrete cleaning
• Paint preparation and surface stripping — 16,000 cleaning units of output handles oils, residues, and surface contaminants in preparation for coatings and industrial finishing applications

5-Year US Warranty, Full Rebuildability, and Wholesale Pricing

Industrial-Grade Performance Backed by Domestic Support

The RKA4G40HNL-VR35 is protected by Annovi Reverberi’s 5-year limited warranty through the US-based warranty and service network. Every internal wear component — solid ceramic plungers, bronze connecting rods, nickel plated brass head seals and o-rings, stainless valve seats and springs, Gymatic VR35 unloader service parts, piston packing kits, and oversized crankcase bearings — is stocked domestically through authorized distribution channels. Contractors, industrial facility managers, municipal purchasing departments, resellers, and volume buyers are invited to contact the WSHPWR wholesale team for pricing on the RKA4G40HNL-VR35 and the complete Annovi Reverberi pump and unloader assembly line. 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.

16,000 Cleaning Units. 4,000 PSI. 4.0 GPM. 45mm Extended Shaft. Nickel Plated Brass Head. 1,750 RPM.

Italian Engineering. Industrial Electric Platform. Belt-Drive Ready. US Warranty Coverage.

For industrial maintenance teams, belt-coupled system builders, facility managers, contractors, and OEM equipment manufacturers who need 4.0 GPM at 4,000 PSI on a low-speed 1,750 RPM electric motor platform — with a 45mm extended solid shaft for v-belt and poly-drive belt coupling, nickel plated brass head for maximum corrosion resistance in chemical-heavy industrial environments, factory-matched Gymatic VR35 unloader, and a completely rebuildable platform backed by a 5-year US warranty — the RKA4G40HNL-VR35 is the purpose-engineered solution from one of the global pressure pump industry’s most trusted manufacturers. Sixteen thousand cleaning units. Extended solid shaft. Low-speed industrial electric platform. Five years of US warranty. A decade of service life.

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