Viper VA4G42S Triplex Pressure Washer Pump – 4.0 GPM @ 4200 PSI, 1750 RPM, 24 mm Solid Shaft

Part Number: VA4G42S
Category: Pressure Washer Pumps
Type: Belt-Drive Triplex Pump – Viper VA4G42S, 4.0 GPM @ 4200 PSI

The Viper VA4G42S Triplex Pressure Washer Pump is a commercial-grade, low-RPM pump engineered for professional belt-driven pressure washer systems. Rated for 4.0 GPM at up to 4200 PSI and operating at 1750 RPM, this pump delivers exceptional cutting power while maintaining smooth, long-life performance. Built with a heavy-duty 24 mm solid shaft and a rugged triplex plunger design, the VA4G42S is ideal for demanding applications where durability, pressure, and reliability are critical.

Manufactured by Viper, this pump is designed for continuous-duty environments such as fleet washing, surface cleaning, and industrial wash systems, offering a perfect balance of high pressure and extended service life.

Product Specifications

• Pump Model: VA4G42S

• Manufacturer: Viper

• Pump Type: Triplex Plunger, Belt Drive

• Flow Rate: 4.0 GPM

• Max Pressure: 4200 PSI

• Rated Speed: 1750 RPM

• Shaft Size: 24 mm Solid

• Bore Diameter: 18 mm

• Stroke: 12.2 mm

• Weight: 21 lb

• Condition: New

Features & Benefits

• High-output 4.0 GPM / 4200 PSI performance

• Low-RPM belt-drive design for extended pump life

• Triplex plunger construction for smooth, low-pulsation flow

• Heavy-duty 24 mm shaft for commercial drive systems

• Built for continuous-duty professional operation

• Ideal for high-pressure surface and fleet cleaning

Applications

• Belt-driven commercial pressure washers

• Fleet wash and surface cleaning systems

• Industrial wash equipment

• Professional pressure washer builds and upgrades

Important Notes

• Verify shaft size (24 mm) and drive configuration before ordering

• Designed for belt-driven systems operating at 1750 RPM

• Final operating PSI and GPM depend on pulley ratio, motor, and overall system configuration