Pentair 2" Bulkhead Nut

The Pentair 2" Bulkhead Nut (part number 190143 or 190143Z) is a specialized, heavy-duty external fastening component engineered exclusively for securing the plumbing connections on high-capacity Pentair Clean & Clear Plus cartridge filters and Quad D.E. pool and spa filtration systems. Injection-molded from a thick-walled, high-impact, and UV-stabilized polymer composite, this wide, low-profile nut features coarse internal threads designed to spin smoothly onto the 2-inch Male Buttress Thread (MBT) of the upper or lower tank bulkhead adapters. Its primary structural role is to serve as the main mechanical retention mechanism that locks the bulkhead fitting immovably against the composite filter tank shell, providing the heavy, uniform compression force required to squeeze the internal sealing gaskets flat. This high-torque closure establishes an absolute airtight and watertight pressure boundary, enabling the large filtration capsule to safely contain continuous hydraulic operating pressures up to 50 PSI without slow weeping, leaking, or thread stripping. Built to withstand constant outdoor UV weathering, intense seasonal temperature shifts, and relentless chemical exposure from concentrated sanitizers like chlorine, bromine, and winterizing acid treatments, this robust locknut prevents structural connection failures under heavy pump vibration. Due to its thick-walled, wide-diameter plastic architecture designed to withstand high installation torque, this individual 2-inch bulkhead nut carries a net product and shipping weight of approximately 0.18 to 0.25 pounds (about 2.8 to 4.0 ounces).