This Replacement filter cartridge comes with a technical specification of Filbur# FC-1228, Pleatco # PA40, and Unicel #C-7442, OEM # CX410RE. It is a high performance filter cartridge can handle a top load of 75 Sq. Ft. This state of the art 75 SQ. FT. Caldera Spa, Watkins Mfg filter with 2" male slip fitting at the top and semi-circular handle at the bottom is of superior quality as per industry standards. It is 14 3/4" long and 7" wide and efficiently provides you dust, sand and worm free clean and clear water solution for your pools and spas. The best in the industry this product matches all your water purifying needs and offers quality with cleanliness and hygiene par excellence.