Pentair WC137-519P Collector Hub Assembly Replacement, Sta-Rite Cristal-Flo T-BP Series T-240BP-1 High-Rate Pool and Spa Sand Filter Collector hub assembly replacement Fits Pentair Sta-Rite Cristal-Flo T-BP series high-rate pool and spa sand filter model T-240BP-1 Measures 26-1/4-inch length by 5-3/4-inch height by 5-3/4-inch width