This adapter sleeve and clamp simplifies the installation of the larger base Walbro 400, 450, 485, 525 and 535 fuel pump into the factory fuel pump housing and carrier.
Included is an all stainless steel mil-spec hose clamp to secure the fuel pump. The sleeve simply slides over the pump until it bottoms out on the base and then you tighten the clamp to secure it in place. Pump is then positioned correctly in your fuel pump hanger by the locator ring on top.