pwk65 Compatible with Watkins 31114, Hot Spot spa Filter, C-8465, FC-3960, 71827, 71828, Watkins 65 sq.ft hot tub Filter, 1 Pack 【SIZE】Length: 10 1/2’’; Outside Diameter: 8 1/2"; Top /Bottom Opening: 3’’; Filtration Area: 65 sq. ft. 【COMPATIBLE MODELS】Compatible with Hot Spot Models:Tempo/ Rhythm/ Relay spa filter, C-8465, PWK65, Watkins 31114, FC-3960, 71827, 71828, Tiger River Caspian, Bengal, Sumatran Spa Filter.Note：The manufacturer’s name and part number have been used for reference purposes only. CRYSPOOL is an independent brand. 【QUALIFIED MATERIAL】The advanced material of trilobal fibers is utilized. Cutting-edge technologies make the capacity higher than common point-bond fabric. It makes water filtration more thoroughly and service life longer. 【EASY CLEANING】The Improved Trilobal Fabric Filter Structure enables the deep penetration of impurities into filter pleats when we wash it, the filter is a totally brand-new one after cleaning. It’s recommended to clean the filter when the pressure gauge reaches the predetermined value, so as to take full advantage of its performance.