35 sq. ft. top load.
1-1/2" MPT thread has an approximate outside diameter of 1-13/16".
4CH-35 replaces: Filbur FC-0161 UPC 645544001610. Pleatco PLT35P4-4 UPC 090164999500. OEM 31382, 6540-486. Unicel UPC 678285240062.
Commonly used in: Hot Springs Spas, Sundance Spas and others.