Originally Posted by sherdep
I dont think you can blow the water back thru the city water connection so the water that you blow back has to go somewhere - either in the tanks or the sinks.
Like Sherdep said, you MUST still blow out the city water check valve from the outside to get the trapped water out of the check valve. If you do not, you will most likely be buying a replacement city water port in the spring.
Also, if you have a Turbo-Flush, you must also blow it out to clear trapped water in ITS check valve.
Don't forget your water pump will not flush out from the low point drains because it also has a check valve filled with water that will prevent it from doing so.
Additionally, if you have a "whole camper" water filter, you will need to drop the filter container and remove the filter; drain, then replace it before you blow out the lines.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW