Guaranteed to fit and seal or your money back

Precision Fit USA brand O-ring for Sta-Rite DynaGlas Pool Pump Lid

compare to U9-375, V26-365, O-12

Also fits the following:

1. Pentair Sta-Rite Pump Lid Oring 355051440, For Max-E-Pro P6 MP, Mfg #: 35505-1440, UPC Code: 788379830397, Same As: Aladdin #: O-12, Super Pro #: O-12-9, Hayward #: SPX3000S, Sta Rite #: U9-375 U9375, SwimQuip #: 35505-1440

You will receive one quality O-ring 

If you have air leaking into your system, notice bubbles jetting into your pool or your pump looses prime when switched off, this could be the problem.  Check your current o-ring for dryness or cracks.  It's easy to check and replace, only takes a minute.