Pentair 2" O-Ring for HiFlow Top and Side Mount MultiPort Valve

Pentair 2" Hi-Flow™ Multiport Valve Tank Top and Side-Mount O-Ring (271151)

The Pentair 2-inch Hi-Flow™ Multiport Valve Tank Top and Side-Mount O-Ring (Product #: 271151) is a factory-original OEM replacement sealing gasket engineered to maintain an absolute, airtight hydraulic barrier between a 2-inch multiport backwash valve and the main filter tank body. Highly compatible with heavy-duty top-mount and side-mount six-position valves across premium pool systems—such as the Triton® II sand filter and Quad D.E.® cartridge-style separation setups—this large-diameter gasket fits snugly within the perimeter groove of the lower valve flange or bulkhead union adapters. When the heavy-duty stainless steel split-clamp band or perimeter bolts are tightened down, this o-ring compresses uniformly against the matching sealing face of the fiberglass-reinforced composite tank, ensuring a complete pressure-side water seal and preventing critical suction-side air leaks. Molded from a high-grade, chemical-resistant nitrile rubber (Buna-N) compound, the component delivers exceptional structural elasticity, long-term ozone resistance, and excellent compression memory, allowing it to withstand prolonged contact with high chlorine concentrations, heavy pool mineral scaling, and chemical shock treatments without distorting or dry-rotting. Replacing this o-ring is an essential maintenance task during any filter teardown or seasonal valve service, as it instantly cures water weeping down the side of the filter tank and stops air induction that can cause pump cavitation or loss of prime. Built to comfortably manage continuous circulation operating line pressures up to 50 PSI and handle extreme seasonal temperature shifts, this ring preserves peak hydraulic efficiency across the entire filtration loop. The physical weight of this single Pentair 2-inch Multiport Valve O-Ring is approximately 0.05 pounds (roughly 0.8 ounces, with a nominal packaged shipping weight of about 0.10 pounds and an overall diameter of approximately 5.5 inches), providing pool professionals and DIY homeowners with a lightweight, incredibly durable, and critical plumbing safeguard for flawless water management.