Pentair 154494 O-Ring Valve Adapter for Tagelus and Triton C-3 Sand Filters O-ring for valve adapter Also fits Pentair Tagelus and Triton C-3 fiberglass pool and spa sand filter models TA 30D, TA 35D, TA 40D, TA 50D, TA 60D, TR 100C-3, TR 140C-3