Flusso Faucets Serie 100 3/4" Three Output Thermostatic Valve With Trim in Satin BrassThe TVH. 4501 Thermostatic valve features 3 4" NPT connections and has 3 water outputs [ports], two of which are operable simultaneously, i. e. both at the same time, or one at a time. SUPPLY STOPS There are two safety stops at each water inlet to prevent water flow in case of installation and repairs. HANDLE OPERATION The middle handle sets the temperature. The top handle controls output port 1 and 2 and the bottom handle controls output port 3. Each