Generic Filter Tank O-Ring for C2000-3000, C3000S, C4000S filter-internal-diameter_6 1/2 inches Note: the disk must be

Note: the disk must be kept flat between tests so water in the disk from previous test doesn't migrate into the untested wells

This is a 16 inch filter disc made by Universal Filtration

They have a 15 degree slope when installed and are 1

This is a carton of 4 Deck-O-Seal Gun Grade two-component

and a caddy cart

Generic Filter Tank O-Ring for C2000-3000, C3000S, C4000S filter-internal-diameter_6 1/2 inches Note: the disk must beThis is a Generic Filter Tank O Ring O 429 replacement with dimensions for Hayward old style DEX360K, Micro Clear and Vertical DE S S, C3000S, C4000S Tank, SwimClear Super StarClear filters. For the Micro Clear filters, this o ring has dimensions for filters with the original filter head.