Flusso Faucets Serie 100 3/4" Two Output Thermostatic Valve and Trim in Matte BlackThe TVH. 4401 Thermostatic valve features 3 4" NPT connections and has 2 water outputs [ports] which are operable simultaneously, i. e. both at the same time, or one at a time. The middle handle sets the temperature. The top handle controls output port 1 and the bottom handle controls output port 2. Each port has full volume control capability and can be activated at the same time. SUPPLY STOPS There are two safety stops at each water inlet to prevent