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Originally Posted by Bama Hammer
This is a bit off the specific topic, but Can a tankless air compressor be used to purge the water system for winterizing?
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If you can keep the pressure down as recommended above, sure, the tankless will be fine.
I've used some very small, inexpensive compressors at the time. If they can fill an auto tire to 35# or so, they'll do your trailer just fine. Just open one faucet at a time and let it go until there's almost no spray coming from it. Then close it up and move to the next one. It's not essential to get every last drop of water out, especially if you're going to pump in RV antifreeze after blowing out.
Even if you don't use antifreeze after blowing out the system, a little bit of residual water in the pipes is not an issue. Remember that for the water to expand enough to break something, it needs to already fill an enclosed space. That's why a bit of water on the floor of your FW or HW tanks doesn't matter. It has more than enough space to expand without breaking anything. Remove 95% or more of the water, and you're OK. But I prefer the antifreezee because it gets into the pump and toilet valve and other places that the air may not clean out.
I currently have a 3 gallon Craftsman compressor that pretty much lives in one of the compartments of the basement. The truck needs 75# or so, and the RideRites can take up to 50#. Like Javi, I have to turn it way down to start the winterizing.
And, for those that might ask, if you have one of those little air tanks that you fill up and take it where needed, that will work too. Just remember that if it's a long trip back to where ever you filled it, you'll have to be watchful of how much you use.
I use my ShopVac to blow out the drain traps and then pour some RV antifreeze into them. Needs less antifreeze because you're not diluting it with whatever is already in the trap.
Come to think of it, one year I used the ShopVac to blow out the water system. I just grabbed a roll of electrical tape and fastened a piece of garden hose to the ShopVac hose, set it to blow, and had at it. Worked fine.