I think the valve in my previous post photo is it and you just need to turn it. It's probably like the one in this photo and has 3 positions. The first would be normal allowing water to go from tank to water pump. The middle would be off and that would be your winterizing isolating the F/W tank and the third is the elusive tank drain.
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2004 Winnebago Minnie 22e(went to a nice family Oct 3, 2015)
2016 Forester 2701DS (Aug 31, 2015)
2017 Camping 12 trips 38 nights
2018 Camping 10 trips 38 nights
2019 Camping 6 trips 19 nights
2020 Camping 0 trips Cancellations 6
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