Compatible with marineland magnum hot polishing internal canister filters,fits above and below cartridge filter. Can be used in salt or fresh water and lasts longer than the original foam gasket. 1 1/2" center diameter for full water flow. 2" OD to completely seal canister, Full 1/8" Thick Quick and easy to install - simply remove the old gasket and replace it with a new one. No special tools are required and the filter is back in operation in minutes. Product include a total of 4pcs rubber gasket, which can completely meet your daily use needs and replacement. xcivi 4PCS Foam Rubber Gasket Replacements Compatible with MarineLand Magnum (ML90770) Polishing Internal Canister Filter Water Filter Gasket Repair