My Hatching time drinker bars were freezing in the bitter cold of upstate NY. I bought 10 of these for my 5 tier setup. I removed the T's and plugs and used the black tubing to hook them all in series. I added a circulating pump at the tank outlet and a return line to the tank from the bottom drinker bar. Lastly I put a 250w bird bath deicer in the tank. It worked at -1 without freezing up. Very pleased.