Pentair Housing O-Ring

The Pentair Housing O-Ring (most commonly referencing part number 35505-1440 or 35505-1440Z for standard pool pumps like the SuperFlo, or part number 152119 for various filter shells) is a specialized, high-capacity elastomeric sealing gasket engineered to maintain a leak-free boundary on various pool and spa equipment housings. Molded from a premium, high-density synthetic nitrile (Buna-N) rubber compound, this large circular gasket features excellent shape memory and elastic recovery. Its primary structural role is to seat securely within the machined perimeter channel at the mating junction of a pump's strainer pot lid or a multi-part filter housing chassis. When compressed by the locking ring, clamp assembly, or hand knobs, this thick-gauge ring flattens uniformly to establish an absolute airtight and watertight compression boundary, allowing the pressurized system to safely contain continuous hydraulic operating pressures up to 50 PSI while preventing air from leaking in or water from weeping out. Built to endure relentless outdoor UV weathering, severe seasonal temperature shifts, and prolonged contact with harsh pool sanitizers like chlorine, bromine, and winterizing acid washes, this durable seal prevents sudden pressure drop or priming loss. Due to its streamlined, low-profile elastomer ring architecture optimized for wide-diameter equipment ports, this individual housing O-ring carries a net product and shipping weight of approximately 0.15 to 0.25 pounds (about 2.4 to 4.0 ounces).