Powers’ high temperature shutoff device is designed to provide thermostatic protection for the shower. If the temperature during the shower reaches 115°F ±3°F 46°C ±1.6°C this device instantly reduces the flow to less than 0.25 gpm from 2.5 gpm. Once the temperature drops below 115°F 46°C the HT115 automatically resets and resumes the full flow within seconds. It is ideal for use with two handle, single handle, pressure balance and temperature control shower valves. It is easy to install and can be used for new or existing installations.Flow Rate Is 4 GPM At 60PSIIt is easy to installCan be used for new or existing installations.