That section of tubing should have pretty much drained when the Water Heater was drained, but if you are concerned, you could open the by-pass valves (with no water pressure). This should allow some of the antifreeze to push out most of the water or at least mix with it. If still concerned, pressurize your water system with 30-40 lbs of air with a compressor and then open the by-pass valves.
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1976 Newell Classic (Sold)
Home Base: Riverside, CA
If anyone needs my contact info private message me and I will send it to you.
-Joseph-
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