Pentair Triton II 6" Buttress Thread Closure Kit

The Pentair Triton II 6" Buttress Thread Closure Kit (part number 154570 or 154570Z) is a specialized, heavy-duty external sealing assembly engineered exclusively for the top access dome of Pentair Triton II side-mount sand filtration systems (including models TR40, TR50, TR60, TR100, and TR140). Injection-molded from a thick-walled, high-impact, and UV-stabilized polymer composite, this comprehensive kit includes the signature 6-inch clear or black dome lid featuring coarse buttress threads, a matching heavy-gauge rubber O-ring, and the manual air relief valve assembly. Its primary structural and operational role is to securely close the filter's main top-access port, establishing an absolute airtight and watertight pressure boundary capable of safely containing continuous hydraulic flow rates and internal system operating pressures up to 50 PSI without weeping, leaking, or blowing out. By incorporating a clear or semi-clear viewport into the design, it allows pool owners and service technicians to visually inspect the internal water level and diffuser performance during operation without opening the pressurized tank. Built to endure relentless outdoor UV weathering, intense solar heat, and continuous exposure to concentrated sanitizers like chlorine, bromine, and seasonal acid washes, this robust closure configuration prevents catastrophic pressure loss. Due to its thick-walled, multi-component plastic and rubber architecture designed to span a wide, high-torque opening, the complete closure kit carries a net product and shipping weight of approximately 2.40 to 2.65 pounds (about 38.4 to 42.4 ounces).