How do I choose the right pressure washer spares for a pump rebuild?

Remove the worn seals and valves and measure them. For seals, record inner diameter, outer diameter and thickness. For valves, record diameter and height. Then match those against the listed sizes, such as 12x20x5.3 for seals or D12 H21 for valves.

What seal sizes are available in this range?

Four single TC oil seal sizes are offered: 12x20x5x7, 12x20x5.3, 12x20x5.2 and 12x18x5. All are rubber. The small thickness differences matter, so measure carefully before ordering.

Will these parts for pressure washers fit my pump?

Fit depends on the seal dimensions and valve diameter and height, not the machine brand. The valves are D12 diameter, in heights H16, H18, H21 and H26.5. Measure your old parts and compare them to the listing. If a dimension is unclear, check the product page before you buy.

What's the most common mistake when replacing seals and valves?

Ordering by diameter alone. A seal with the right bore but the wrong thickness, or a valve with the right D12 diameter but the wrong height, won't seat or seal correctly. Measure all dimensions on the old part.

What material are the oil seals made from?

The seals listed are rubber TC oil seals in a ring gasket shape. The data doesn't state temperature or oil compatibility limits. Check your pump manufacturer's service information to confirm rubber suits your operating conditions.

Which kit suits a full pump-end rebuild?

Kit 2 and Kit 3 each pair two seal sizes with two valve components. Kit 2 has 12x20x5/7 and 12x18x5 seals with D12 H21 and D12 H16 valves. Kit 3 has 12x20x5.3 and 12x20x5 seals with 12x26.5 and 12x18 components. Pick the one that matches the sizes in your pump.

Pressure Washer Spares

61 products available

Looking for pressure washer parts for trade and industrial use? This department covers the wear items that keep a pump running: nozzles and tips, seal and repair kits, hoses and connectors, foam lances and surface cleaners, lances and guns, and pumps and unloader valves. It suits workshop engineers, contract cleaners and maintenance teams who repair machines rather than replace them.

The range here is narrow and focused on the pump end. Compel carries oil seal and valve repair kits built around TC rubber oil seals and D12 valve components, supplied in single sizes and in mixed kits. If your machine needs a rebuild at the seal and valve level, you can match the sizes against the listing and order the right kit first time.

61 products in Pressure Washer Spares

Close-up of a black trigger spray gun with a brass nozzle and brass fitting at the front end

Lances & Guns

Pressure Washer Lance and Gun Trigger | M22 Male + G1/4 Female | 280bar

TBS-08768PWSP-00008

£114.99

Coiled black pressure washer hose with the pressure rating printed along the cover

Hoses & Connectors

Pressure Washer Hose Replacement 10m | 160 Bar | 1/4 Inch Bore

TBS-08748PWSP-00006

£95.99

White plastic valve component with a black O-ring on a flat surface

Seal & Repair Kits

Pressure Washer Replacement Parts Kit | Oil Seals & Check Valves | 12mm

TBS-08745PWSP-00004

£37.99

Stainless steel and brass drain cleaning nozzles arranged in a circle on a white background

Nozzles & Tips

Pressure Washer Drain Cleaning Nozzle | Rotary Sewer Jet | 120MPa

TBS-08740PWSP-00003

£27.99

Black pressure washer lance wand with a rotating nozzle at the tip on a plain background

Nozzles & Tips

Pressure Washer Rotary Nozzle Lance | 43cm | For K2 to K7 Models

TBS-08732PWSP-00001

£49.99

Showing page 3 of 3 (61 products)

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.

Buying guide

Choosing Pressure Washer Spares

How do I choose the right pressure washer spares for a pump rebuild?: Remove the worn seals and valves and measure them. For seals, record inner diameter, outer diameter and thickness. For valves, record diameter and height. Then match those against the listed sizes, such as 12x20x5.3 for seals or D12 H21 for valves.
What seal sizes are available in this range?: Four single TC oil seal sizes are offered: 12x20x5x7, 12x20x5.3, 12x20x5.2 and 12x18x5. All are rubber. The small thickness differences matter, so measure carefully before ordering.
Will these parts for pressure washers fit my pump?: Fit depends on the seal dimensions and valve diameter and height, not the machine brand. The valves are D12 diameter, in heights H16, H18, H21 and H26.5. Measure your old parts and compare them to the listing. If a dimension is unclear, check the product page before you buy.
What's the most common mistake when replacing seals and valves?: Ordering by diameter alone. A seal with the right bore but the wrong thickness, or a valve with the right D12 diameter but the wrong height, won't seat or seal correctly. Measure all dimensions on the old part.
What material are the oil seals made from?: The seals listed are rubber TC oil seals in a ring gasket shape. The data doesn't state temperature or oil compatibility limits. Check your pump manufacturer's service information to confirm rubber suits your operating conditions.
Which kit suits a full pump-end rebuild?: Kit 2 and Kit 3 each pair two seal sizes with two valve components. Kit 2 has 12x20x5/7 and 12x18x5 seals with D12 H21 and D12 H16 valves. Kit 3 has 12x20x5.3 and 12x20x5 seals with 12x26.5 and 12x18 components. Pick the one that matches the sizes in your pump.