Pentair Clean & Clear Plus/FNS Plus Tank O-ring

The Pentair Clean & Clear Plus/FNS Plus Tank O-Ring (part number 190003 or 190003Z) is a critical, heavy-duty perimeter sealing component engineered specifically for high-capacity Pentair Clean & Clear Plus cartridge filters, as well as FNS Plus and Quad D.E. filtration systems. Molded from a premium, high-density synthetic nitrile (Buna-N) rubber, this expansive circular gasket features a thick cross-sectional profile tailored precisely to lay within the deep perimeter sealing channel found at the main center junction of the two-piece composite filter tank shell. Its primary structural role is to form an absolute airtight and watertight compression boundary between the upper tank lid and lower base, allowing the large pressure vessel to safely contain continuous, high-velocity hydraulic flow rates and operational pressures up to 50 PSI without weeping or leaking. Built with excellent elastic shape memory and resistance to compression set, this resilient elastomer seal easily withstands intense outdoor UV weathering, repetitive pump vibration surges, and prolonged contact with highly concentrated sanitizing chemicals like chlorine, bromine, and seasonal acid shock treatments. Due to its thick-walled architecture and wide diameter required to wrap entirely around the main tank chassis, this durable rubber ring carries an individual product and shipping weight of approximately 0.31 pounds (about 4.96 ounces).