I use the air compressor method all the time here but the compressor is a tankless 12VDC model. It takes a longer time to build up pressure which is what I like to see when connected to the city water port.
![](http://ecx.images-amazon.com/images/I/51OrkyXicCL._SL500_AA300_.jpg)
They warn you against hitting the water lines with alot of air pressure...
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
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2005 Flagstaff 8528RESS