This replacement filter has the technical specifications as Unicel # C-5374, Pleatco # PLBS75, Filbur # FC-2971 and OEM # R173600. It can bear the top load of 65 sq. ft. It is great quality filter cartridge and best for Rec Warehouse, Waterway Plastics, Pentair Pool Products-Rainbow Pl, Weslo spas, Leisure Bay Spas , Icon Spas, Leisure bay mfg, Image spas, Cal Spas. It lets not any dust particle or worm to enter in you pool or spa and enables you to get pure and clean water. It has 2 1/8 inch hole both at the top as well as bottom and it is 14 13/16 inch long and 5 5/16 inch wide.