I have a 2012 3750FL and have the valve on both sinks. In the bathroom it is inside and towards the back of the vanity behind and down stream from the "P" trap. It is on a vertical PVC "extension". I would imagine if you don't see something like that then you don't have it and likely don't need it. Mine was doing the same thing .....pee yew ....and my replacement valve just arrived from Amazon so will get it installed later today.
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Phil and Rudee
2012 3750FL Hickory Ed.
2009 Dodge Ram 3500 Mega Cab
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