SIMPSON AAA90039 front view shows a durable triplex pump for heavy-duty cleaning
SIMPSON AAA90039 side view demonstrates install-friendly pump replacement
SIMPSON AAA90039 hardware and siphon tube detail supports quick installation
SIMPSON AAA90039 oil sight glass aids easy oil level monitoring
SIMPSON AAA90039 PowerBoost label indicates adjustable nozzle pressure for efficiency
SIMPSON AAA90039 hose inlet and quick-connect outlet show standard connections

SIMPSON

SIMPSON AAA 90039 Horizontal Triplex Pump Kit — 4000 PSI, 3.5 GPM, 1-inch Shaft

High-performance patio lawn and garden made for confident daily results

$453.67

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Why customers choose Cera Garden

Overview

Upgrade or replace your gas pressure washer pump with the SIMPSON AAA 90039 Horizontal Triplex Pump Kit. Designed for machines with a horizontal engine and a 1-inch shaft, it can deliver up to 4000 PSI at 3.5 GPM. The stainless steel integrated unloader includes an easy-start system for smoother operation, while dual oversized ball bearings reduce friction for longer life in demanding cleaning environments. This kit arrives ready to install with hardware and a siphon tube for a complete swap, making it a practical option for maintaining performance on a busy job site.

Key benefits

  • Extend the life of your pressure washer by replacing the pump instead of the entire unit, keeping walls, driveways, vehicles, and more clean with fewer interruptions.
  • PowerBoost Technology delivers higher nozzle pressure when you need it, with a hand turn knob to dial down pressure for gentler tasks.
  • Dual oversized ball bearings reduce friction, supporting smoother operation and longer life in tough cleaning environments.
  • Stainless steel integrated unloader with an easy-start system helps initiate work smoothly and maintain stable performance.
  • Oil sight glass and advanced oil seal technology provide quick visibility into oil level and oil condition for easier maintenance.

Compatibility and installation

  • SAE standard bolt pattern fits many gas pressure washers with horizontal engines. To ensure compatibility, match engine orientation, PSI, GPM, shaft diameter, and current pump inlet/outlet connections.
  • Standard garden hose inlet and quick-connect high-pressure hose outlet enable use with common hoses and accessories.

What’s included

  • Pump body rated up to 4000 PSI at 3.5 GPM, with hardware and siphon tube for a complete replacement kit.

Note: Verify your unit’s inlet/outlet orientation to confirm compatibility. This kit targets machines that support up to 4000 PSI and 3.5 GPM with a 1-inch shaft, including many industrial gas-powered setups.

FAQ

Q: What machines is this pump kit compatible with?

A: Designed for gas pressure washers with horizontal engines and a 1-inch shaft; verify inlet/outlet orientation and PSI/GPM match.

Q: How can this kit benefit my pressure washer?

A: Includes pump, hardware, and siphon tube; replacing the pump can extend service life and save money while maintaining cleaning power.

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