Winterizing

If you drain the low water points, do gou still have to pump antifreeze through the ststem?

I don't. In my 1990 Winnebago Warrior it has 4 drain valves. They are the lowest point in the water system and they drain the water completely. I also open all faucet valves in the RV so that there is no vacuum lock preventing complete draining.

I once tried one of those "blow out" fittings and nothing but air came out. Our system drains so completely there was no water to blow out. So, I haven't done it in years now.

I pour antifreeze into the drains so that the P-traps don't freeze, and that's it. I never put antifreeze into the fresh water system.

Steve