Pentair #2-228 Collar and Rotor Union O-Ring

The Pentair #2-228 Collar and Rotor Union O-Ring (Product #: 271103) is a factory-original OEM replacement sealing gasket engineered to provide an absolute, leak-proof hydraulic barrier within 2-inch multiport backwash valves on premium pool and spa filtration systems. Specifically designed for Pentair and PacFab Hi-Flow™ top-mount and side-mount six-position valves—commonly paired with Triton® series sand filters and Quad D.E.® separation tanks—this specialized ring stretches securely onto the central internal rotor stem and collar assemblies. As the valve handle is depressed and rotated to select different operational cycles like Filter, Backwash, or Rinse, this dynamic o-ring creates a tight compression seal against the inner walls of the valve body and cover housings, preventing pressurized pool water from escaping the designated flow chambers or leaking out through the upper handle. Molded from a high-grade, chemical-resistant nitrile rubber (Buna-N) compound, the component delivers exceptional compression memory, superior structural elasticity, and long-term ozone resistance, allowing it to withstand continuous exposure to high chlorine concentrations, heavy pool mineral scaling, and repetitive mechanical friction without tearing or dry-rotting. Replacing this gasket is a vital maintenance step that instantly cures common equipment pad issues, such as water weeping down the side of the valve flange or suction-side air induction that causes pump cavitation and a loss of system prime. Built to endure continuous operating line pressures up to 50 PSI and extreme summer pump room heat, this featherweight part ensures the filtration loop operates at peak efficiency. The physical weight of this single Pentair #2-228 O-Ring is approximately 0.01 pounds (less than 0.16 ounces, with a nominal inner diameter of 2.23 inches, a cross-section thickness of 0.139 inches, and a packaged shipping weight of roughly 0.05 pounds), providing pool professionals and DIY homeowners with an essential, low-cost, and highly reliable hardware safeguard for flawless water management.