Pentair 271096 White Bulkhead Union Replacement Set Pool and Spa Filter Bulkhead union replacement set Fits Pentair Triton II, TR100C and TR140C pool and spa sand filters Also fits Pentair Clean & Clear Plus cartridge and FNS Plus D.E. pool/spa filters For installations without valve Measures 2-1/2-inch length by 2-inch height by 2-1/2-inch width