The Unicel C-4312 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-4312 Comp. Hayward C-120 Pool Filter has an outer diameter of 4 5/8 inches, with a length of 11 7/8 inches. This Unicel pool filter has an open top and bottom with both having diameters of 2 1/8 inches. This Unicel C-4312 filter contains 12 square feet of filter media.