Pentair 1.5" and 2" HiFlow Top Valve O-Ring

The Pentair 1.5" and 2" Hi-Flow™ Multiport Top-Mount Valve O-Ring (Product #: 271151 / 271151Z) is a factory-original OEM replacement sealing component engineered to establish an absolute, watertight mechanical barrier at the primary junction of high-capacity pool and spa sand filters. Specifically designed to seal the large perimeter flange between the filter tank neck and the bottom of Pentair 1.5-inch and 2-inch top-mount Hi-Flow™ six-position backwash valves—which are commonly paired with Sand Dollar®, Tagelus® (including models TA60D and TA100D), and Cristall-Flo™ series sand filtration vessels—this heavy-duty, large-diameter ring sits securely within a precision-molded seating track. When the heavy-tension flange clamp or bolt assembly is torqued down, the ring compresses uniformly to prevent pressurized water from weeping out of the filter neck and blocks catastrophic suction-side air induction under continuous system operating line pressures up to 50 PSI. Molded from a premium, high-grade ethylene propylene diene monomer (EPDM) rubber compound featuring a 70-durometer hardness rating, this elastomeric seal delivers exceptional dimensional compression memory and superior ozone resistance, allowing it to withstand continuous exposure to high chlorine or bromine shock, salt-chlorine generation, and intense outdoor UV radiation without flattening, tearing, or dry-rotting under extreme seasonal equipment pad heat. The physical dry product weight of this single Pentair HiFlow Valve O-Ring is approximately 0.06 pounds (roughly 0.96 ounces, with a nominal packaged shipping weight of up to 0.15 pounds depending on retail bagging), providing an essential, low-cost hardware standard to maintain peak filtration circulation and baseline energy efficiency.