Originally Posted by timfromma
What I do is open both winterization valves then blow into the winterization hose to force an water left back into the FW tank. A tiny bit of water in the tank won't hurt anything since it will have plenty of expansion room when it freezes.
For the city water connection, you need 2 people. Before you do this step make sure that there is no pressure inside the water lines. Remove the screen inside the connection. You will see a little white button, this is the check valve. One person needs to stand outside and push that button to hold the check valve open. Valve damage can occur if you press the button while the system is pressurized. Have the other person turn on the water pump until you see antifreeze flow out.
I asked the same question a while back. Only way that seems practical is yours where you are disconnecting suction line from pump. On my TT this isn't exactly practical due to pump installation and for winterizing I have a 3-way valve that switches pump from tank to outside anti-freeze port. Still working on a way to resolve this ----- easily. Will say that after two winters the line hasn't been damaged. Apparently it has enough flex to freeze/thaw without damage.
As for the City Water Connection, I blow my lines out. This clears the short length of pipe/hose before it reaches the 3-way valve. Once the valve is changed to anti-freeze port, no water gets back into the line.