{"product_id":"pentair-3-1-2-union-nut-black","title":"Pentair 3-1\/2\" Union Nut Black","description":"\u003ch2 data-path-to-node=\"0\"\u003ePentair 3.5\" Black Union Nut Replacement (98212200Z \/ 98212200)\u003c\/h2\u003e\n\u003cp data-path-to-node=\"1\"\u003eThe Pentair 3-1\/2\" Black Union Nut (Product #: 98212200Z \/ 98212200) is a factory-original OEM replacement hardware component designed to maintain rigid, leak-free plumbing connections across a broad selection of Pentair cartridge and diatomaceous earth (D.E.) filtration systems. This critical coupling collar is engineered for seamless compatibility with standard Clean \u0026amp; Clear®, Predator®, Warrior®, and EasyClean® aboveground filter lines, serving as the primary mechanical interface that locks external plumbing adapters tightly against the filter vessel's bulkhead. Injection-molded from a high-strength engineering thermoplastic polymer, this heavy-duty nut provides complete immunity to aggressive pool chemicals, high salt concentrations, and continuous mineral scaling, while its deeply saturated black composite formula features built-in UV stabilizers to prevent structural brittleness, warping, or cracking under intense outdoor weathering and high-temperature pump pad environments. The collar features thick, molded external ridges that allow service technicians or pool owners to easily generate maximum manual hand-tightening torque during seasonal assembly, securely compressing internal sealing gaskets and locking down union C-clips without stripping threads or requiring specialized wrenches. By continuously absorbing high-frequency system vibrations, hydraulic pressure spikes, and backpressure surges up to a standard rating of 50 PSI, this retaining nut effectively isolates fluid lines to prevent suction-side air induction or pressure-side water weeping. The physical weight of this standalone Pentair 3-1\/2\" Black Union Nut is approximately \u003cb data-path-to-node=\"1\" data-index-in-node=\"1669\"\u003e0.25 pounds\u003c\/b\u003e (with a boxed shipping weight of roughly 0.35 pounds), delivering a lightweight yet exceptionally robust, durable, and vital plumbing safeguard for pristine pool circulation networks.\u003c\/p\u003e","brand":"Commercial Pool and Spa Supplies","offers":[{"title":"Default Title","offer_id":53165489684591,"sku":"98212200Z","price":19.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0678\/3785\/3807\/files\/Screenshot_4_1iek-35.png?v=1779896018","url":"https:\/\/commercialpoolandspasupplies.com\/products\/pentair-3-1-2-union-nut-black","provider":"Commercial Pool and Spa Supplies ","version":"1.0","type":"link"}