SINGLE PACK MADE IN THE USA POOL AND SPA FILTER MEASUREMENTS: Diameter: 5" Length: 20 1/8" Top: Open Hole: 2 1/8" Bottom: Open Hole: 2 1/8" Filter Area: 75 sq ft Filter Material: REEMAY (3 oz/yard) Popular brand part numbers: Pleatco: PRB75 Unicel: C-4975 Filbur: FC-2395 Replaces the following filters: Custom Molded Products Dakota Spas Emerald Spas Hydro Pool Industries Nahani Spas by Maax Pentair Pool Products Rainbow Plastics Serenity Spas and other manufacturers 17-2623 | 25390 | R173435 | 17-3435 | R172623 | 17-2632 | RTL-75 | Rainbow Dynamic 75 | 17-175-1600 | APCC7221 | 17501 | 17-2632 rtl-75 | PRB 75