WSM Performance 003721K Complete 4-Tec Jet Pump Assembly: Seadoo

Restore propulsion with the WSM Performance 003721K Complete 4-Tec Jet Pump Assembly designed for Sea-Doo.

Key Features

• Complete WSM jet pump assembly for Sea-Doo 4-Tec models listed by application (see Product Details and verify against your jet pump housing/impeller setup).
• 159mm jet pump assembly for the 003-721K model line.
• Includes the main jet pump assembly components needed to replace a worn unit rather than rebuilding individual parts (confirm your service plan and replace related seals/gaskets during install).

Product Compatibility

• Sea-Doo PWC (4-Tec), for use where a WSM 003-721K complete jet pump assembly is specified in the application listing.

Product Details

• WSM Performance complete jet pump assembly part number: 003721K (SKU: 848-003721K).
• Catalog reference: 003-721K Jet Pump Assembly, Complete (Sea-Doo 1503 4-Tec). ([wsmparts.com](https://www.wsmparts.com/Search/PartsSearch/BrowseSearch/?Catalog=1&Category=0&Level=4&Section=7&SubSection=1&utm_source=openai))
• Application/fitment details shown by WSM for 003-721K include Sea-Doo 1503 4-Tec coverage. ([wsmparts.com](https://www.wsmparts.com/Search/PartsSearch/BrowseSearch/?Catalog=1&Category=0&Level=4&Section=7&SubSection=1&utm_source=openai))
• Jet pump size listed for this assembly family: 159mm. ([wsmparts.com](https://www.wsmparts.com/Search/PartsSearch/BrowseSearch/?Catalog=1&Category=0&Level=4&Section=7&SubSection=1&utm_source=openai))
• Package weight (from Shopify variant): 3629 grams.

Parts Desk Insights

Best Use Case: Best for jet pump overhaul when you want a complete assembly replacement for a Sea-Doo 4-Tec 1503 application using the 003-721K (159mm) specespecially when multiple wear items are suspected at the same time.

Common Issues: After installation, common problem areas include misalignment during re-mounting, overlooked related seals/hardware, and drive shaft/wear-ring mating surface issues. Confirm the jet pump mounting surfaces are clean, check the service manual steps for torque/seating order, and verify your existing prop/drive setup matches the jet pump spec.

Related Products & Accessories

• Browse Jet Pump & Housing Parts (Sea-Doo) – Find related components such as wear rings, seals, and other jet pump service items by searching the correct WSM 003-721K/jet pump category in the store catalog.