Mikuni Fuel Pump Block.
#21 on BN 46 I Series Carburetor Diagram.
This part is commonly replaced because the plastic tee fittings on Sea-Doo's 951 carburetors break and this fuel pump body has the tee already installed in it.
The tee is not available separately.
Replaces Sea-Doo OEM 270500410
SBN 46 I carbs Sea-Doo 951 engine applications