Cash Acmes, Heatguard Hot Water Tank Booster, Combines A Heatguard Thermostatic Valve, A Flexible Connector & A Water Heater Tee In 1 Package, The Thermostatic Valve Is Factory Set At 120 Degrees Fahrenheit & 49 Degrees Celsius But May Be Easily Adjusted, Use With Sharkbite Flexible Water Heater Connectors, Not Included, For Easy Installation In Systems Using Copper, CPVC Or Pex Tubing, No Need For Additional Transition Fittings, Use In Residential & Commercial Applications To Control The Temperature Of Distributed Hot Water.