Camping World winterized my coach this year - I too have a 2016 29.4 and wanted it done right since I bought it in late Oct. They charged me $38.00 (on top of the discounted priced coupon I had for the entire coach) because of the out door sink. I did not know about the switch and will look tomorrow. I was told access to the drains for the water tank and the outdoor sink was through a panel in the bedroom below the first drawer. Removing that panel allows access to the water tank. I asked that mine be re-routed to make it more accessible, complaining that it was a design flaw to get to them. Thor said it wasn't - and refused to pay for any modification. I can do it - I just haven't yet. But the switch is an intriguing concept.......hopefully I will have one!
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