Originally Posted by gmillerok1
Don't later Interstates now have valves as well?
Nope. But the 2013s seem to have a different tank than the 2012s. Mine has the drain valve flush with the bottom of the tank, without the sump pictured for the 2013 model shown in the original post.
Last time I had to drain the water, I thought the drain valve on mine was the same size as an oil pan drain plug, just made of PVC. If so, then they make valves to replace the drain plug on an oil pan, and I thought of buying one. But then again, I don't have to drain the tank very often, and decided it wouldn't be worth the expense. Especially since the valve would stick down far enough that it could snag on something and get knocked open, knocked loose, or knocked off.