Be careful that you don't over-tighten the drain plug. Screw it in hand tight and only with a wrench a bit more. Check for leaks, tighten a bit more if needed. If you have a metal plug be very careful when threading in and tightening it, if you mess up the threads on the tank it could make for a very expensive repair, like a new tank. That is why the plugs are made out of nylon.

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My Great Wife Joyce
2018 Jayco Jay Flight 21QB
Formerly owned 1705T and 2310H
2012 F150 4X4 SuperCrew EcoBoost w/Leer Cap
Reese WD Strait-Line Hitch
Amateur Radio K3EXU

Those drain valves certainly fit in tight spaces, but I find the handles hard to turn. I prefer to use a brass valve with a handle. Here is a photo of the installation on my Hi-Lo:
http://www.hilotrailerforum.com/f27/...allation-2903/

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Raul

2408T
2010 Nissan Frontier, 4x4, Crew Cab