This replacement filter cartridge comes with a technical specification Filbur# FC-3027, Pleatco # PH3.7-B, Unicel # C-2304 and OEM # 133269. This product can handle a top load of 20 Sq. Ft. and is a high performance filter cartridge. This state of the art 20 SQ. FT. LA SPAS SOCK FILTER SUBSTITUTE filter is of superior quality as per industry standards. This filter comes with closed top and anOpen Hole of 1 1/16" at the bottom. It is 6" in length and 2-3/4" wide. It 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.