Pentair TR100 Air Relief Tube

The Pentair Filter Tank O-Ring (primarily part number 39010200 or 39010200Z) is a critical high-pressure compression seal engineered exclusively for the split-tank chassis boundaries of Pentair's flagship residential and commercial pool filtration vessels. This genuine original equipment manufacturer (OEM) replacement gasket is standard hardware designed specifically for the perimeter mating channels of the Pentair FNS Plus Diatomaceous Earth (D.E.) filter series (models FNSP24, FNSP36, FNSP48, and FNSP60) as well as the Clean & Clear® Plus multi-cartridge filtration line (models CCP240, CCP320, CCP420, and CCP520).

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Molded from a heavy-duty, high-density synthetic rubber or EPDM elastomeric compound, this large-diameter circular O-ring measures approximately 21.5 inches in diameter with a robust 1/4-inch cross-sectional thickness. Its primary operational role is to sit flush within the dedicated structural mating channel positioned between the upper tank lid and the bottom half tank shell. When the heavy-duty metal tension clamp band assembly is wrapped around the filter seam and torqued to specification, the O-ring undergoes tight radial compression to establish an absolute watertight and airtight pressure boundary. This robust elastomeric barrier prevents weeping at the tank seam and safely contains the immense hydraulic forces generated by high-velocity pump filtration cycles, allowing the pressurized filter vessel to continuously sustain internal system operating metrics up to 50 PSI without failing under sudden pump startup thrusts or intense mechanical vibration surges.

Engineered to endure decades of demanding outdoor pool pad weathering, relentless hydraulic cycling, and shifting seasonal thermal stresses, its advanced rubber matrix completely resists flattening, compression set, material brittleness, and advanced oxidative degradation from constant contact with pool chemical vapors and highly concentrated sanitizers like chlorine and bromine. Due to its large circular footprint and solid elastomeric core, this replacement filter tank body O-ring carries a net product and shipping weight of approximately 0.45 to 0.55 pounds (about 7.2 to 8.8 ounces).