Interpump Pressure Washer Piston 20 X 50mm - OEM Number: 47.0404.09

The Interpump Pressure Washer Piston 20 x 50mm (OEM 47.0404.09) is a replacement ceramic piston designed for compatible Interpump high-pressure washer pumps. The piston operates within the pump head, working with the associated seals to generate the high-pressure water flow required for effective pressure washer operation.

Manufactured from hard-wearing ceramic, the piston provides a smooth, wear-resistant surface for the pump seals to operate against. Its 20 mm diameter and 50 mm length make it suitable for a range of Interpump 47 Series and associated W and WS Series pumps, including WS201 applications. Replacing a cracked, scored or worn piston can help restore pressure performance and reduce the risk of damage to the surrounding seals and pump components.

FUNCTION AND OPERATION

• Forms the reciprocating pressure-generating element within the pump.
• Works with the high-pressure seals to pressurise the water supply.
• Provides a smooth sealing surface for the associated pump seals.
• Helps maintain consistent pressure and water flow.
• Ceramic construction provides good resistance to wear and operating conditions.
• Replaces a cracked, scored or excessively worn original piston.

TECHNICAL DETAILS

• Brand: Interpump
• OEM Number: 47.0404.09
• Part Type: Ceramic pump piston
• Material: Ceramic
• OD: 20 mm
• ID: 14 mm
• Length: 50 mm
• Pump Series: Interpump 47 Series

TYPICAL APPLICATIONS

• Interpump W101, W131, W151 and W201 pumps
• Interpump W912, W913, W914, W916, W921 and W922 pumps
• Interpump WS82, WS101, WS102 and WS131 pumps
• Interpump WS133, WS151, WS171 and WS201 pumps
• Interpump WS202, WS251 and WS252 pumps
• Other compatible Interpump pumps using the 20 x 50 mm piston.

IMPORTANT INFORMATION

The piston is supplied individually. Many compatible Interpump pumps use three pistons, so three replacement pistons may be required when carrying out a complete piston replacement. When replacing a piston, the condition of the associated seals, anti-extrusion rings and retaining components should also be checked.

Always check the pump model and OEM number before ordering to ensure the correct piston is selected for the particular Interpump pump assembly.

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.