1975 Tradewind Land Yacht- Location of fresh water drain valve

[dirtman]

We purchased a 1975 Tradewind Land Yacht. We are attempting to wintertize it and the manual states there are three drain valves located under the galley. I have located the hot and cold water valves and drained the respected lines. However, I cannot locate the main valve that drains the fresh water tank, nor can I find a dedicated drain line under the trailer. Any advice or clues?? I'm new to airstreams but do have experience with winterizing my slide in camper.

[dwightdi]

Some models in the mid 70's did not have drain valves for the supply water tank. My 77 we have to pump it dry with the water pump and then put in a little RV antifreeze to prevent the remainder from freezing.