Length: 6-5/8" Diameter: 4-15/16" Top opening: 2-3/16" Bottom opening: 1-1/2" MPT threaded Replaces popular brand part numbers: Unicel 4CH-22 Pleatco PFF25P4 Filbur FC-2399 Features: 19 sq. ft. of high quality filtration fabric  Expansive Flow™ core Alternative filter names:  TLX, RLX, FF-150, 4CH-22, FC-2399, SAC0006, 17-175-1960, 303263, PFF 25, PFF25 W/ PAD-4 AD Used in pools/spas made by: Freeflo Spas, Freeflow Spas & other manufacturers   By Guardian Filtration Products • 4H6-212