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Old 11-01-2006, 06:52 AM   #15
1 Rivet Short
1989 25' Excella
By The Bay , Rhode Island
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One caution when using a compressor to blow out the water lines; keep it under 45 psi. That is the max rating for RV plumbing systems.
I do mine at ~ 35 psi just to be safe, that is more than enough to move any water out of the lines...


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Old 11-01-2006, 07:32 AM   #16
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2004 30' Classic Slideout
Fenton , Missouri
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Just to reiterate the key with air pressure is for it to be high enough to really blow out all the water. My dealer winterizes trailers without antifreeze but the key is the pressure. My little 12 volt can't generate the amount of pressure necessary so while I use it to displace the large volumes of water, I follow up with RV antifreeze to make sure. If you don't blow the lines out well, any residual water left in the system will drain back to a low point, and if enough gathers it becomes freeze time.

The other thing to remember for those of you using air only is to take care of the drain traps and get some antifreeze into those. One trick I have used is to reverse my shop vac and actually blow the water out of the traps, then add a small amount of antifreeze to keep the traps from venting sewer gas...and don't forget those minor areas when you blow out lines like the toilet rinse sprayer, the kitchen sink sprayer, and for some of you the outside water outlet.

Jack Canavera
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'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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