Pentair 1" O-Ring

The Pentair 1" Equipment and Valve O-Ring (Product #: 355619 / 355619Z) is a factory-original OEM replacement sealing component engineered to maintain an airtight, leak-proof hydraulic barrier across specialized pool, spa, and water treatment connections. Commonly utilized to seal critical fluid junctions including high-efficiency pump internals, 1-inch plumbing union adapters, specific automatic chlorinator lines, and commercial valve ports on Pentair, PacFab, and Sta-Rite® equipment pads, this specialized round-profile ring sits securely inside a precision-machined plumbing groove. When the mating components are tightened down under standard operational torque, the gasket compresses uniformly to establish a positive pressure-side water barrier and block catastrophic suction-side air induction that would otherwise cause pump cavitation and a loss of system prime. Molded from a high-grade nitrile rubber (Buna-N) compound featuring a 70-durometer hardness rating, the component delivers an ideal balance of 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 advanced pool sanitizers without flattening, tearing, or dry-rotting. Built to comfortably manage continuous system operating line pressures up to 50 PSI and handle extreme seasonal equipment pad heat, this flexible part ensures the entire water loop operates at peak hydraulic efficiency. The physical dry weight of this single Pentair 1" O-Ring is approximately 0.01 pounds (roughly 0.16 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.