SPX1600T is a flat gasket.mine is a thin round o-ring and that one looks to be flat
could it be that the housing gasket shown recesses back in a groove? making it looks like an o-ring


Aladdin Hayward Super Pump Housing Gasket - SPX1600T - G-95 - INYOPools.com
G-95 - GASKET, HOUSING (G-95) (SPX1600T)
