This replacement filter cartridge comes with a technical specification Filbur# No, Pleatco # PWWDFX75, Unicel # C-6375 and OEM # 817-0018. This product can handle a top load of 75 Sq. Ft. and is a high performance filter cartridge. This state of the art 75 sqft Waterway Plastics Dyna-Flo XL, Crystal Water Spas (Canada) is of superior quality as per industry standards. This filter comes with 2 3/8" open hole at the top and at the bottom. It is 13-5/16" in length and 6-9/16" 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.