Interpump Pressure Washer Seal Kit - OEM Number: Kit 28

The Interpump Pressure Washer Seal Kit (KIT 28) is a replacement seal assembly designed for compatible Interpump high-pressure washer pumps using 20 mm plungers. The kit provides the sealing components required to service one pump piston, helping maintain the separation between the high- and low-pressure areas of the pump and prevent water leakage around the plunger.

The complete assembly includes the required high- and low-pressure seals, O-rings and brass components for rebuilding one piston. Replacing worn sealing components can help restore pressure performance, reduce water leakage and extend the service life of the pump. A complete three-piston pump overhaul generally requires three KIT 28 assemblies.

FUNCTION AND OPERATION

• Provides replacement sealing components for one 20 mm pump plunger.
• Maintains separation between the high- and low-pressure areas of the pump.
• Helps prevent water leakage around the plunger assembly.
• Supports the pump's ability to maintain operating pressure.
• Replaces worn, damaged or leaking piston seals during pump servicing.
• Includes the associated brass components and O-rings required for the seal assembly.

TECHNICAL DETAILS

• Brand: Interpump
• Kit Number: KIT 28
• Part Type: Pressure washer seal kit
• Plunger Diameter: 20 mm
• Application: High-pressure plunger pump
• Coverage: 1 piston / plunger
• Kit Contents: High- and low-pressure seals, O-rings and brass components
• Unit of Sale: 1 kit

TYPICAL APPLICATIONS

• Interpump 47 Series pumps
• Interpump W101, W151, W201 and W912–W921 series pumps
• Interpump WS101, WS151, WS201 and WS202 pumps
• Interpump WS251 and WS252 pumps
• Selected W, WS, T and TS series pumps using 20 mm plungers
• Other compatible Interpump high-pressure pumps requiring KIT 28

IMPORTANT INFORMATION

KIT 28 services one piston only. Pumps with three pistons will normally require three kits for a complete seal rebuild. Always confirm the pump model, series and plunger diameter before ordering to ensure the correct seal kit is selected.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£30.00 for delivery before 10:30am
£25.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.