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Sporlan 278399-121 Valve 326058-757 Common Technical Questions How doThe Sporlan 278399 121, model QL171R 12 12, is a high performance 3 4" ODF service valve designed for rigorous HVACR applications. Built with a heavy duty brass body and a stainless steel stem, this manual shut off valve provides reliable refrigerant isolation during system maintenance. It features a robust Buna N seal to ensure leakproof integrity across a wide operating range of 40F to 250F. Engineered for modern high pressure systems, the Parker