SINGLE SPA FILTER REPLACES: Pleatco: PH6 | Unicel: Purex | Filbur: FC-2310 • Diameter: 2 3/4" • Length: 9 3/4" • Top: Open Hole: 1 1/16" • Bottom: Open Hole: 1 1/16" • Filter Area: 6 sq ft • Filter Material: REEMAY (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: 24101-19 | 17-2006 | 174819 | 174865 | 17-2048 | FC-2315 | FC-3061 | FC-3062 | C-2606 | T-380R | C-2306 | 57000500 | ST6-3 | ST6 | 250006 | C-2308 | FC-2308 | Lifeguard CL 9 | American | Harmsco ST/6 | Swimquip 6 | Swimquip 108 | Swimquip 216 | Swimquip 72 | Universal Six | OTC/6-4 | 57011400 | American Caribe 133 | American Caribe 184 | American Caribe 368 | 17-2055 | 17-175-1280 | APCC7009 | 10601 | 090164030005 | T-380 | FC-3060 | ST/6 | SD-00762 | PH 6 | PH6-3 | PH6-4 Used in pools / spas made by: American Products | Harmsco | Lifeguard | Pac Fab | Pentair Pool Products | Premier | Purex | Rainbow Plastics | Sonfarrel | Springwater | Sta-Rite | SwimQuip and other manufacturers