Tank Booster thermostatic mixing valve for a water heater. This valve allows you to get almost twice the capacity of 120 degree hot water out of your existing tank. It mixes cold water with super hot water in your tank back down to regular temperatures. If you have a gas waterheater this allows it to cycle less and for shorter periods saving wear and tear. The hotter tank temperature also prevents mold and bacteria growth in your tank as it is hot enough to kill anything. Firm on price. Comes with everything in the picture including the braided hoses and tee fitting. No trades, we can meet at the Mall 205 or Johnson Creek Home Depot.