Hold on just a minute! I'm not familiar with details of the water supply layout of the 1st generation 2015 21' model, but in our 2017 (2nd generation) 21', the water pump and winterizing t-valve are indeed located under the driver side dinette seat (rear; see photo). We ordered the rear driver side exterior hatch, and I can easily reach in through the rear hatch (to the left) to access the water pump and winterizing t-valve with attached suction hose for lowering into the jug of antifreeze (after removing the power cords and wheel chocks I store there). It's also easy to reach the primary electrical components through the rear hatch (to the right). We love the rear hatch for electrical cords, wheel chocks, etc., and use the front hatch for water hoses and other water-related things (filter, pressure regulator, etc.), so we don't need a front utility box and plan to use that tongue space for a bike rack.
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