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Old 11-11-2013, 06:50 PM   #15
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If open it allows the system to better drain out the low point, simple.

Second it allows movement due to the air in the system.

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Old 11-12-2013, 11:01 AM   #16
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I had to make a stop at Apache Camper and posed this question to the Service Dept Manager. He told me that after they put antifreeze through the line the faucets are closed. They have done that for years. When they leave the lot they are closed and under pressure. Also he told me to make sure addiquite amounts are in the toilet bowl since it will evaporate out. They put in about 3-4" above the trap.

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Old 11-12-2013, 08:33 PM   #17
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No-one can/has proved their position, I say it makes no difference, other than forgetting to close the faucets when de-winterizing, and pumping anti-freeze down the drain instead of catching it for re-use next winter. Kinda like why leave the holding tank drain valves open or closed while winterized. Where's a mouse gonna go if it enters the tank?
When we bought our MH, the faucets were closed, holding tank drain valves were open,winterizing performed by Camping World.
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Old 11-14-2013, 01:13 PM   #18
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Originally Posted by StevieG View Post
If you leave the tap open, it won't burst. It gives the ice someplace to go... Into the sink.
Your correct!
I have had this exact thing happen so you are correct if it does start to freeze it will goes right into the sink and helps protect the water system from bursting. JR
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Old 11-15-2013, 03:07 PM   #19
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one more vote for 'open'

One winter our fifth wheel got so cold the antifreeze in the kitchen faucet froze and expanded enough to crack the fixture. Now we have a shiny new faucet and an established practice of leaving all the taps open after winterizing.
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Old 11-15-2013, 06:13 PM   #20
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In a water pipe the ice freezes outside in. That's why on a copper pipe there's a bulge where it splits . I don't believe that leaving the faucet open will help anything if there's water in the pipes.
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Old 11-15-2013, 08:57 PM   #21
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Common sense just begs me to leave the valves open. If you leave them closed, there's no chance that the water can escape... No matter how minimal that chance might be. Out of all the responders who believe they should leave them closed, I haven't heard a single reason why... If I heard an explanation that made sense, I would be the first to change my way of doing things...

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