Battery Transfer pump for antifreeze

DutchmenSport wrote:

Nothing wrong with your method. Lots of folks winterize their water lines using the compressed air method. The only drawback with this method is, sometimes water lines may have dips in them, or low spots and all the water may not successfully extract, subject to freezing. However, with all pressure off and space for ice to expand, nothing ever gets damaged.

Any water droplets left in the system will freeze. Depending upon where those droplets remain could potentially freeze and of course, any water that freezes will expand. If those droplets are in water valves, or joints, it's possible they could expand enough to cause leaks.


As stated, blowing air works, and is successful for lots of folks. And quite frankly, I've not heard of anyone having any problems after using the blow method.

Two travel trailers ago, I used the blow method. To my sad disappointment though, the outside shower head on the end of the hose still split over the winter. Replacing it was easy, but after that I returned back to the Antifreeze method and been doing so ever since.

I see this over & over, do it wrong and blame the method.

I rarely see a big enough compressor being used and / or blowing out the system long enough.

I’ve even seen people using 12 volt portable compressors to ‘blow out’ the lines.

If done properly there will be no where near enough water left in the system to cause any damage whatsoever.

Because of my north - south travel numerous times over every winter I winterize my units more than once per month every year and have for many years, never had a problem.