The Unicel C-8405 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-8405 Comp. Pool Water Filter - DM-180 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-8405 filter contains 175 square feet of filter media.