DIAPHRAGM ACCELERATOR PUMP SQUARE 951 SEADOO 800 1200 YAMAHA MIKUNI BN40I/22 GPThis Aftermarket diaphragm is used to replace the hard to find O. E external fuel accelerator pump diaphragm that are used on the Sea Doo & Yamaha Carburetors. There are two different diaphragm options that could have been used square or round this listing is for the square type. Please look at the pictures to identify yours. 1997. 5 Sea Doo GSX Limited Mikuni SBN I Carburetor Accelerator Pump Diaphram (Square)1998 Sea Doo GSX L Mikuni SBN I