Pentair 274494Z #2-332 Valve Adapter O-Ring For Tagelus(R) Filter; Top/Side Mount Valve; FullFloXF Backwash Valve; FNS Filter; Nautilus; Nautilus Plus D.E. Used On Pentair PacFab Tagelus Sand Filters, TA100 Pentair PacFab Triton II Sand...