How I Winterized my Coach

..To keep from destroying the water system on the RV I built a tool to reduce the pressure to a manageable amount.

I went to Harbor Freight (I hate using them as everything comes from China, but in this case was the logical choice) and then to Home Depot and picked up an air regulator and the necessary fittings....

Every air compressor I've owned or worked with already has a pressure regulator, that would allow you to set the pressure down to something lower like 30 or 50 psi or whatever. Never had to buy or build one separately, but apparently you do when working with the larger, upright air compressors. I've always used smaller horizontal portable type compressors (5 gallon, 125psi max), and they've always had the regulator.

Either way, you're absolutely right that you need that regulator, as you do not want to push 110 psi through your water lines!

...I chose 30 PSI as a safe pressure level..

30 psi is not enough pressure to get enough water out of the lines. When I've used 30 psi, I could still hear 'gurgling' in the water lines; bump it up to 50 or so, and no more gurgling, just air.

You need to set it to between 50 and 60 psi, and you'll get MUCH more water out of the lines. You'll get enough out, that the antifreeze really is not necessary in the water lines. Your water lines can easily handle this much pressure (50-60 psi).

I've been doing it this way for as long as I can remember (4 different RVs over the last 15 years), and never had a problem yet. I can also point you to one major, respected RV manufacturer (Tiffin) that is known to use the compressor blow-out method (no antifreeze in the water lines) for units they ship north to cold climates. I can also point you to an RV technician with many, many years experience, that is contracted to winterize RVs up in the mountains that are set up there permanently, in the mountains. He also, uses and recommends the compressor blow-out method only. If this method is good enough for the ones that build RVs, AND for one that works on them and winterizes units that stay up in the mountains...Its good enough for me. :)

Anyway, thanks for sharing the pictures, and what you did to winterize yours. The part showing how you built your own pressure regulator, definitely should be helpful to some folks. :)