Pressure Washer Spares

Choosing pressure washer replacement parts: seals first

Most pump-end failures trace back to worn oil seals and tired check valves. A leaking seal lets oil out and water in. A weak valve costs you pressure. Replacing both together is usually quicker than chasing one fault at a time.

The seals in this range are TC oil seals in rubber, with a ring gasket shape. Match three dimensions: shaft or inner diameter, outer diameter, and thickness. The four single seal sizes offered are 12x20x5x7, 12x20x5.3, 12x20x5.2 and 12x18x5.

• Measure the old seal before you order, and check the lip and the housing bore.
• Thickness differences are small, so 12x20x5.3 and 12x20x5.2 are not interchangeable by eye.
• Rubber is the only seal material listed. Check your pump's service data for oil type and temperature limits.

Matching valve diameter and height

Check valves in this range share a D12 diameter. The variable is height, with H16, H18, H21 and H26.5 offered. Measure the valve you pull out and match it. A valve that's too short or too tall won't seat properly in the pump head.

Getting diameter right but height wrong is a common reason for a repair that doesn't hold pressure.

• D12 is the only valve diameter listed.
• Heights offered: H16, H18, H21 and H26.5.
• Confirm the height on the listing rather than assuming from the pump brand.

Single seals or a mixed repair kit

Buy single seals when you know exactly which size has failed. Buy a kit when you're rebuilding a pump and want matched seals and valves in one order. Two mixed kits are listed.

Kit 2 holds 12x20x5/7 and 12x18x5 seals with D12 H21 and D12 H16 components. Kit 3 holds 12x20x5.3 and 12x20x5 seals with 12x26.5 and 12x18 components. Check your pump's seal and valve sizes against these contents before you order.

These parts cover the pump-end seals and valves only. For nozzles, hoses, guns and complete pumps, check what each listing states for fit and rating.