Many thanks. I did get the cold water supply lines drained and filled with antifreeze but the myriad of valves still has me somewhat stumped. Under the bed I found a supply line to the water pump that allowed me to connect a 'T' valve I found at the local RV shop. With that attached I simply dropped the attached hose into a gallon jug of antifreeze and ran the pump and filled all the cold water supply lines.
Hopefully running the coach heater overnight (forecast low of 9) will keep the hot water lines ok until I figure out which valves to turn which way to fill them rather than the hot water heater.
Ed
2015 CS 24SR
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