Pentair Black Rubber Drain Cap Gasket

The Pentair Black Rubber Drain Cap Gasket (part number 86300500) is a small but critical sealing washer designed for a variety of Pentair pool and spa filtration systems and push-pull valves, including the Clean & Clear, Clean & Clear Plus, Predator, Meteor, and Eclipse series. Molded from a durable, high-density black rubber compound, this flat gasket features standard dimensions of 13/16-inch internal diameter, 1-5/8-inch outside diameter, and a 1/8-inch thickness. Its primary structural role is to sit perfectly nested inside the filter's plastic drain cap assembly at the very bottom of the tank chassis. When the cap is threaded hand-tight onto the tank's lower drain spigot, the rubber compresses tightly against the plumbing threads to establish an absolute watertight seal that stops slow weeping and prevents high-pressure leaks when the tank is operating up to 50 PSI. Engineered to resist distortion from constant compression, this heavy-duty washer easily withstands prolonged exposure to outdoor weathering, fluctuating winterized temperatures, and harsh sanitizing chemistry such as chlorine, bromine, and seasonal acid washes. Because it is a streamlined, compact elastomer ring, it adds virtually no weight to the filter assembly, carrying a nominal product and shipping weight of approximately 0.05 to 0.10 pounds (about 0.8 to 1.6 ounces).