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The Isolator is a uni-flange ball valve that isolates a circulator pump, allowing virtually no air into the system during pump replacement or service. Its innovative design combines multiple components into a single forged brass body that saves time, labor and space. The Isolator has revolutionized the installation of circulator pumps and has evolved into the largest flanged ball valve program in the industry today, featuring patented technology with further patents pending. These straight thread valves are compatible with similarly sized Webstone products, including Air Separators, Differential Pressure By-Pass Valves, Magnetic Boiler Filters, and Thermostatic Mixing Valves. Designed for use with in residential or commercial plumbing and heating systems. Refer to specification sheets for additional technical information. All Webstone products are backed by a limited lifetime warranty.