Here is another illustration for what I mean (of course, your water system must be similar for this to work):
Since I "reverse engineered" my water system, there could be a mistake - but I am pretty sure this is correct.
As an aside, one thing that has been nagging me is there is no shut-off valve for the antifreeze injection port, other than the plug tightness in the top of the line.
However, if it is not completely tight, I can see where this could inject a bit of air in my water lines. So I think next year, a new project is to install a valve in the line of the injection port so this does not happen.
Using a single valve with a plug to keep air out of the line just seems to me to be another cost cutting example that RV manufacturers are famous for.
However, in this case, their cost-cutting might actually allow you to inject sanitizer into the water tank, as the aftermarket antifreeze kits I have seen (Camco) use a three way valve to either:
- block off the water tank and connect the antifreeze port to the pump
- connect the pump to the port and block off the antifreeze port
I don't think these valves would allow you to connect the antifreeze port to the water tank.
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