Here are the vacuum controls all hooked up. This is on the drivers side. The way it is set up---when you turn on the 3 speed fan switch it allows water to go to the heater. I was glad to see the vacuum control valve they used. Some of you may remember that I tested 6 of them and this was the one that leaked the least. I may one day mount one of these heaters in the back of the coach it is small enough to go many places. I must admit I am in love.
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