These straight thread fittings are compatible with similarly sized Webstone products, including Air Separators, Differential Pressure By-Pass Valves, Magnetic Boiler Filters, and Thermostatic Mixing Valves. Monitor temperature readings at key locations, such as near an appliance or within a closed loop. Designed for use with water, oil, glycol mix 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.