Pentair 2" 2000 and 4000 Series PVC Plug

The Pentair 6" Triton II Buttress Thread Closure (part number 152519Z, formerly 154570) is a high-strength structural pressure dome engineered exclusively for the top access hatch of Pentair Triton II series side-mount sand filtration systems (including models TR40, TR50, TR60, TR100, and TR140 manufactured after December 1, 1991). Injection-molded from a thick-walled, glass-reinforced black polymer composite, this 6-inch diameter cap features specialized, coarse buttress-style threads. These heavy-duty threads are specifically designed to handle single-direction thrust forces, allowing the lid to spin securely into the filter neck and establish an absolute airtight and watertight compression boundary when seated against its main sealing O-ring.

This robust architecture allows the sand tank to safely manage massive water distribution volumes and sustain continuous internal operating pressures up to 50 PSI without weeping, thread-binding, or risking catastrophic blowout under pump vibration surges. The crown of the closure includes integrated ports to accommodate the manual air relief valve and pressure gauge assembly for quick air elimination. Engineered to survive decades of demanding outdoor equipment pad weathering, it completely resists intense UV degradation, extreme seasonal temperature shifting, and concentrated pool sanitizers like chlorine, bromine, and winterizing acid flushes. Due to its thick-gauge composite construction and coarse thread design, this individual 6-inch buttress closure carries a net product and shipping weight of approximately 1.50 to 2.00 pounds (about 24 to 32 ounces).