Jim, it all depends on your floor plan.
The one 345 I'm familiar with had the east west bed and the drain valve was under the bed where the water tank was located. Look for a pipe/tube coming off the side of the tank at the bottom that routes to a hole in the floor. Somewhere in that line should be a valve.
Brad
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Air forums # 1674
1974 20' Argosy Motor Home
1975 24' Argosy Motor Home
1974 31' Excella trailer (parting out, as of 4/1/2015 I have wheels & windows left to sell)
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