Dimensions
Diameter: 125 mm (4 15/16")
Length: 338 mm (13 5/16")
Top: 54 mm (2⅛") hole
Bottom: 54 mm (2⅛") hole
Filtration surface area: 50 square feet (212 pleats)

Note that this filter has exactly the same dimensions as the C-4326 / PRB25, but has twice as many pleats and therefore twice the surface area. The two models are completely interchangeable, but if you are in any doubt about which filter to use, we suggest that you stick with the version that was originally supplied with your spa.

Manufacturers who use this filter
Aber Hot Tubs, Accent Spas, Acryx-Maax, Alps Spas, Angels Spa, Arctic Spas, Aqua Dolce, Aqua Tech, Aquiform-Infinity, Artesian Spas, Baja, Beachcomber Spas, Belize, Blue Falls Manufacturing, Blue Pacific, Bullfrog Spas, Caldera, Cal Spas, Charisma, Clair Azur, Clipper, Coast Mountain Spas, Coast-Spas, Coleman Spas, Columbia, Coyote Spas, Crystal Waters, Diamante, Haven Spas, Hydropool, Hydro Spa, Jacuzzi, JFC, Kanebo, Nordic Hot Tubs, Northern Lights Hot Tubs, Peips, Phoenix, Rotospa, Sierra Spas, Signature Spas, Southwest Spas, Sun Coast, Sundance Spas, Sunrise Spas, Tiger River, US Spas, Viking Spas, Vita Spa, Warm Springs, Wind River

Manufacturer part numbers for this filter
Pleatco: PRB50
Unicel: C-4950
Filbur / Clarathon: FC 2390
Waterway: 817-5000
Pentair / Rainbow: 17-2380
Beachcomber: 3005815
Coleman Spas: 3301-2145
Sundance Spas: 373045 (formerly 6540-471)

This filter is also available in Microban
Microban inhibits the growth of bacteria on the surface of your hot tub filter. Microban filters stay clean longer and last longer than conventional spa filters.