Originally Posted by Scarab0088
This YouTube hits all the high points of winterizing
That is a good RV winterizing video. Thanks for posting.
This method relies on being able to use compressed air to blow out all the water in the RV plumbing by attaching a regulated compressed air fitting to the city water connection.
1. Air compressor.
2. Adapter fitting from compressed air to city water hose connection.
3. Pressure regulator to prevent exceeding max. plumbing system pressure.
After draining the fresh water tank and "isolating" and draining the hot water heater, I use the electric water pump to suck air from the empty fresh water tank and "blow" the water out of the plumbing lines. I open the cold and hot water taps one at a time. I turn on the water pump for 2 or 3 seconds (just enough time for air to blow out) for each tap (plus the foot flush toilet).
Except for the city water connect, all the plumbing lines are then mostly free of water. I pour 2 gallons of RV antifreeze into the fresh water tank. That is enough to prime the electric pump and blow a little bit of pink anti-freeze out of each the plumbing fittings, one at a time.
The messy part is back flushing the city water supply with RV anti-freeze. With all faucets closed, I run the electric water pump just enough to build up some pressure. Then I go out to the city water connect and after removing the strainer, I push the check valve pin and a slug of water comes spraying out of the connection until the residual pressure in the line goes to zero. The internal spring resets the check valve and I do another partial pressure of the system using the electric water pump. Then go to the city water connect and push the pin again. Do that enough times until the pink RV anti-freeze sprays out of the city water supply connection. It can get real messy if you use full water pump pressure when you push the check valve.
I didn't mention the holding tanks or "P" traps since that is identical to the video.
I'm sure the 20 minute "Jiffy-Lube" or "Jiffy-Winterize" guys have their winterizing procedure. IMHO 20 minutes would be the fastest winterizing procedure I ever saw. Sort of like a NASCAR pit crew doing a 4 tire change.