2 Pack Guardian Pool Spa Filter Replaces Unicel C-4950 Pleatco PRB50-IN Filbur FC-2390 Length 13-5/16", Diameter 4-15/16" to 5", Top opening 2-1/8", Bottom opening 2-1/8" Replaces Unicel C-4950, Pleatco PRB50-IN, Filbur FC-2390 2-Pack50 sq. ft. of high quality REEMAY Filtration Fabric 2-Pack Guardian Filtration Products 413-212-02 New in Factory Packaging Unicel C-4950 Filbur FC-2390 Pleatco PRB50IN <span class="a-text-bold">Diameter:</span> 5&#034; <span class="a-text-bold">Length: </span>13-5/16&#034; <span class="a-text-bold">Top: </span>2-1/8&#034; open hole <span class="a-text-bold">Bottom: </span>2-1/8&#034; open hole