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Old 11-06-2002, 05:25 PM   #1
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What size air compressor is needed to blow of the water lines for winterizing? This is my first winter, and I have a feeling the little portable 12V compressor I keep in my car won't work...


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Old 11-06-2002, 05:50 PM   #2
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i've got an old dayton speed air, about a 30 gallon tank.

i would think one of the small to medium craftsman compressors sears sells would work fine.

the more volume (tank) the better.


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Old 11-06-2002, 07:54 PM   #3
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Air compressor

Greetings Craig!

I took a slightly different approach to the situation. I wanted a small 120 volt unit that I could carry in the back of my tow vehicle to inflate my tires on both the trailer and tow vehicle before I left camp. It turns out that it works for all kinds of situation on the RV - - it will work for blowing out the water lines on the Airstream if you don't mind listening to the compressor motor. I chose a Sears Craftsman 1.0 horsepower unit without tank with a variable pressure control of from 20 psi to 120 psi. It cost a little over $100.00 on sale (regular price was $120) two years ago. It only weighs about five pounds and has traveled with me all over the country.

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Old 11-07-2002, 07:28 AM   #4
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Sounds like a good option. What do you set the pressure at for blowing out the lines?

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Old 11-07-2002, 08:21 AM   #5
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Generally when "winterizing," it is recommended that a 5 HP or more, compressor be used, so that you have an adequate volume of air. Use maximum pressure, as the water pressure regulator will accordingly reduce the pressure as well as the "pop-off" valve would come into play should the regulator fail.

Small compressors do not have adequate volume.

I am sure that some owners have been successful using a small compressor, but the rule of thumb says no.

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