2 PACK Filters Pleatco: PSG13.5P4 | Unicel: 4CH-19 | Filbur: FC-0122 Diameter: 4 3/4" Length: 5 15/16" Top: Handle Bottom: 1 1/2" MPT Threaded Filter Area: 14 sq ft Filter Material:Reemay (3 oz/yard) Used in pools / spas made by: Dolphin Spas | Leisure Bay Spas | Rec Warehouse | Saratoga Spas and other manufacturers