Folks, might check your winterization instruction if you have them! Mine say definitely do not use air to purge water lines! I use about 4 gallons of the pink stuff and the factory installed antifreeze inlet! Turn on one facet at a time, let it run pink on both hot and cold after by passing the water heater. Letting a pint or so of pink run, should take care of the drain traps. Kill electric to water heater, drain through anode then flush with water to remove any sentiment from tank. Wait a couple of days then tape and replace anode. Using this procedure for about 10 years with no issues. With the use of pex fittings would be a repair I would like to avoid if damage did occur from the use of air. Happy camping!
Marriot2 on Wheels 2017 Flagstaff Classic 832 OKBS
2013 GMC Denali 6.6L 2500 HD DMAX w\Alison Trans
Pepper Pomeranian rescue 101 days as camping buddy
Days camped in FR, 2011 = 20, 2012 = 57, 2013 = 59
... 2014 = 39, 2015 = 52, 2016 = 68, 3 more planned