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BillHoughton's avatar
BillHoughton
Explorer II
Nov 29, 2015

One solution for the blow out plug

I just water-winterized my new-to-me RV for the first time. The Itasca manual describes a blowout plug, male hose fitting on one side, tire valve on the other. The nearest store that carried them was farther than I wanted to drive, but my local hardware store had fittings that would make up into the same thing.

But then it hit me: the manual shows a locking tire chuck on that plug, and recommends introducing the air pressure slowly, so as not to damage the water pump. The "slowly" sounded like a ball valve* to me, and I don't have a locking tire chuck. And there I was in the hardware store, so I wound up with the male hose fitting, a ball valve, and the male end of the quick-release on my air compressor. Hook up the air compressor with the valve closed, slowly open it, and I've got a rig that lets me monitor the flushing of water out of the lines without an assistant.

This may have been a touch more expensive than the "factory" solution, but probably not, if I'd had to buy a locking tire chuck and some kind of valve to bring the air pressure up slowly.

Offered here in case it works for others.
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*Ball valves aren't the best for feathering air pressure. They tend to go from zero to max with very slight movements of the handle. But, with some finesse, they'll work, and they're compact and quick in case, which is why I selected that valve type. Other valve types that will provide more delicacy are available.

8 Replies

  • I assembled a fitting with a air tool quick-connector and a garden hose threaded fitting (with a size reducer to mate them together). These parts were all available at Home Depot, and just got screwed together with the standard teflon tape. It's all brass, and it allows a large volume of air to flow, and will probably last long enough to be passed down at least a few generations.

    If you have a pressure regulator on your compressor, I don't think there's much need to worry about throttling the airflow provided you dial it down to a reasonable level. If the pump is not harmed by 50 psi from city water, it shouldn't be harmed by 50 psi from an air compressor.

    Not that there's anything wrong with having a valve in the air line, of course!
  • RoyB wrote:
    This is what I use to blow out my water lines using my tankless 12VDC Air Compressor. I use this adapter at the city water port on my off-road POPUP. (AMAZON two day shipping)...




    My tankless 12VDC air compressor builds up air pressure slowly so this gives me time to walk from faucet to faucet to bleed out the water...

    We like to camp late into the season and this allows me to winterize my OFF-ROAD POPUP in about five minutes time after I drain the fresh water tank. Then usually the next morning it warms up good and I just add fresh water again and be back in business...

    Roy ken


    I bought one of these this year, but didn't use it...will probably do a giveaway for it.
  • On many air compressors the line pressure can be set with the regulator. I often reset mine for various tools and tasks. JIm
  • RoyB's avatar
    RoyB
    Explorer II
    This is what I use to blow out my water lines using my tankless 12VDC Air Compressor. I use this adapter at the city water port on my off-road POPUP. (AMAZON two day shipping)...




    My tankless 12VDC air compressor builds up air pressure slowly so this gives me time to walk from faucet to faucet to bleed out the water...

    We like to camp late into the season and this allows me to winterize my OFF-ROAD POPUP in about five minutes time after I drain the fresh water tank. Then usually the next morning it warms up good and I just add fresh water again and be back in business...

    Roy ken
  • BillHoughton wrote:
    Won't work for everyone; worked for me.


    That's all that matters. Thanks for sharing, it's always nice to get different ideas. :C
  • Yes, I knew that. Mine does the same thing slightly differently. Won't work for everyone; worked for me.

    Fred, my Itasca has a setting on the water fill that basically bypasses the water tank, for times when you're using a water hookup. The blowout plug goes into that, as did my Christmas tree of fittings.
  • If you included the 2-3 gallons of gas to go pick up the supplies, I think that you have a great overall price of what you are using, plus the 1/2" ball valve can flow several cubic feet of air per minute, while the schrader valve only has a free opening of a fraction of one square inch!

    I installed a tee fitting on the outlet of my water pump. Most of the year there is a pressure gauge sitting there, but I can remove it in a few seconds, install a 1/4" air hose from my compressor, and blow out the lines very quickly. . . Your set up with a quick connect seems like a much better idea. I have a Harbor Freight nearby, and can get a set of air tool fittings for about $8.

    Fred.
  • Locking chuck is so you can connect the air light and then go about opening each faucet.
    What you have will work!
    Make sure you do not hit the rig with high air pressure, it only takes 15-30 pounds to blow out the lines.