Hayward Duralite Lens Gasket SPX0540Z2
These are not OEM, these are Quality TORK Brand replacement parts
Black rubber lens gasket used on the Hayward Starlite and Duralite and the Purex CHD / Pool Star lights.
This round gasket has a small channel on the inside.
7-7/16" O.D.; 7" I.D. on one side; 6-3/4" I.D. on other side; 2" thick front to back