Pentair 2" PVC Slide Valve Piston O-Ring

The Pentair 2" PVC Slide Valve Piston O-Ring (Product #: 190141) is a factory-original OEM replacement sealing component engineered to maintain absolute fluid isolation within high-capacity pool and spa plumbing manifolds. Specifically designed to fit the central moving shaft assembly of Pentair and PacFab 2-inch PVC push-pull slide backwash valves—which are commonly paired with premium Triton® series sand filters and FNS® Plus vertical grid D.E. separation tanks—this specialized round-profile ring sits securely inside the machined grooves of the internal piston. When an operator pushes or pulls the manual valve handle to cycle between standard filtration and high-velocity backwashing, these o-rings slide smoothly along the inner chamber wall, compressing uniformly to form a positive pressure-side seal. This mechanical action blocks internal fluid bypass and eliminates catastrophic water weeping out of the backwash waste line or suction-side air induction that would otherwise cause pump cavitation and a loss of system prime. Molded from a high-grade, chemical-resistant nitrile rubber (Buna-N) compound featuring a rigid 70-durometer hardness rating, the component delivers exceptional structural elasticity, superior ozone resistance, and long-term compression memory, allowing it to withstand continuous exposure to high chlorine or bromine concentrations, heavy pool mineral scaling, and rapid thermal cycling without flattening, tearing, or dry-rotting. Built to comfortably manage continuous system operating line pressures up to 50 PSI, this flexible seal ensures the entire filtration loop operates at peak hydraulic efficiency. The physical dry weight of this single Pentair 2" Slide Valve Piston O-Ring is approximately 0.012 pounds (roughly 0.19 ounces, with a nominal packaged shipping weight of 0.05 pounds), providing pool service professionals and DIY homeowners with an essential, low-cost, and highly reliable hardware safeguard for flawless water management.