I usually blow out all my water lines with my compressor but since I've moved to a colder region of the country I'd like to be able to add RV antifreeze to the lines next winter.
My water pump in in the worse place to try to add a winterizing valve up stream (between water tank and pump). The PEX comes up through the floor from the water tank to the filter and then to a 90 deg fitting that connects to the Aquajet. The connection to the pump is a fitting that is secured to a quick release on the water pump housing. I was thinking of getting another fitting with a piece of hose and have the AS water pump suck the antifreeze though the system but I'm afraid of disturbing this connection too much causing a leak eventually. The PEX is very inaccessible and I don't have any special tools to work with PEX to cut and splice in a diverter valve. I don't think there is enough space to splice in a valve.
On the output side of the pump is a flexible and very accessible hose that forms a loop to lessen water pump noise. I could easily splice in a diverter valve on this hose. I could then get another pump and plug it into my TV's 12v
socket and use that pump to fill the lines with antifreeze. The antifreeze will be blocked from entering the water tank and AS water pump by the check valve.
Is this feasible?