The Unicel 5CH-45 hot tub filter includes a 2-1/8 inch hole on top and 1-1/2 inch male MPT threads on the bottom, and it is designed to fit select Freeflow spa models Legend and Passport. Specifications:
Diameter: 5-5/16"
Length: 10"
Top: 2-1/8" Open
Bottom: 1-1/2" MPT Thread
Replacement for: Pleatco PFF50P4, Filbur FC-2401 and Master Deluxe M50452
