2 Guardian Pool Spa Filter Replaces Unicel C-5345-FC-2970-PlbS50-Rainbow Waterway Plastics Outside Diameter: 5 5/16" Length 10 1/8" Top Opening: 2 1/8" Bottom Opening: 2 1/8" Media Weight - 3 oz. SQ FT Media - 45' Unicel - C-5345 (C5345) Filbur - FC-2970 (FC2970) Pleatco  PLB-S-50 (PLBS50)