Filbur FC-2390 Filter Cartridge (Pleatco #PRB50-IN, Unicel #C-4950) This is an original Filbur OEM manufactured filter Replaces Filbur #FC-2390, Pleatco #PRB50-IN, Unicel #C-4950 O.D. 5 ", Length 13 5/16", Top Hole 2 1/8 ", Bottom Hole 2 1/8 ", Area 50 Sq Ft. These filters are one of the best you can buy and provide you with excellent life verses cost value Made in the U.S.A.