Pleatco: PA225 | Unicel: C-4325 | Filbur: FC-1220 • Diameter: 4 5/8" • Length: 11 7/8" • Top: Open Hole: 2 1/16" • Bottom: Open Hole: 2 1/16" • Filter Area: 25 sq ft • Filter Material: Pleatco Advanced (4 oz/yard) Note: 4 oz filtration material is 33% thicker than the standard 3 oz. As a result it will last longer and filter more thoroughly. Alternate Filter Names: CX225-RE | C-225RE | C-4327 | FC-0640 | 570105 | 57010200 | 57010500 | Hayward MicroStar-Clear C-225 | 17-175-1035 | APCC7059 | PA225-4 | PA225 | PA 225 | PA225-M4 Used in pools / spas made by: American Products | Apollo Spas | Emerald Spas | Hayward | Pentair Pool Products | Sonoma Spas and other manufacturers