The Unicel C-4403 R is a pool and spa water filter cartridge that is the correct compatible replacement for the following filters:
The Unicel C-4403 Comp. Spa Filter Cartridge has an outer diameter of 4 5/8 inches, with a length of 11 5/8 inches. This Unicel spa filter has a closed top with a crescent style handle, and an open bottom with a diameter of 1 3/4 inches and a male slip fitting. This Unicel C-4403 filter contains 25 square feet of filter media.