The Unicel C-8406 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-8406 Comp. Pool Filter Cartridge - DM-240 has an outer diameter of 8 7/8 inches, with a length of 39 inches. This Unicel pool filter has an open top and bottom with both having diameters of 4 inches. This Unicel C-8406 filter contains 240 square feet of filter media.