Operating without external power source, ¾ in. TM Valve can be set for opening at any temperature from 35–255°F. Freeze Protection applications operate with valve starting to open at 39°F and fully opening at 35°F. Unit will start to close at 38°F and fully close at 42°F. Available in brass or stainless steel, TM Valve is suited for safety showers, solar panels, and condensate systems.