Replacement AAA Pressure Washer Pump, 3700Psi, 2.5GPM

Replacement AAA Pressure Washer Pump, 3700Psi, 2.5GPM

Engineered to deliver strong cleaning power while minimizing engine load, the 90037 AAA® Triplex Pump is a high-performance replacement pump kit for gas pressure washers using a horizontal engine with a 3/4" diameter shaft (commonly found on engines like the Honda GX200). Capable of producing up to 3700 PSI at 2.5 GPM, it’s a dependable upgrade for tough cleaning jobs where durability and efficiency matter.

Designed for long service life, the 90037 uses dual oversized ball bearings to reduce friction and improve reliability in harsh environments. It also features a stainless steel integrated unloader with an easy-start system, plus a sight glass and advanced oil seal technology that eliminates the need for a dipstick.

Country of Origin: Varies by production batch

Key Features / Specifications

• Pump model: 90037
• Pump type: AAA Triplex Pump
• Power type: Gasoline
• Max pressure: 3700 PSI
• Flow rate: 2.5 GPM
• Shaft diameter: 3/4"
• Inlet/outlet size: 3/4" (as listed)
• PowerBoost: Yes
• Head material: Brass
• Pump body: Black aluminum
• Unloader: Stainless steel integrated unloader with easy-start system
• Lubrication/monitoring: Sight glass and advanced oil seal tech (no dipstick needed)
• Bearings: Dual oversized ball bearings for reduced friction and longer life

Fitment Notes

• Designed for gas pressure washers with horizontal-shaft engines and 3/4" shaft (ex: GX200-style).
• Important: Check your pressure washer’s inlet and outlet orientation to ensure compatibility before ordering.

Ideal For

• Replacing worn pumps on 3/4" shaft gas pressure washers
• Users needing solid performance at 3700 PSI / 2.5 GPM
• Commercial and heavy-duty cleaning where durability is important
• Anyone wanting an easy-start integrated unloader and long-life triplex design