The new Dometic hot water heaters have a confounded drain CAP, not a plug like the old ones. Mine was dripping with just water in the tank, once it was heater, it forced water past it. When I took it off to drain the water heater, it was deformed from the heat.

Anyhow, the first picture is of the confounded cap. The following ones are the 1/4 turn brass valve I put on it. I bought the valve at Lowes.

The drain pipe is aluminum, and I'm aware the aluminum and brass have a metallurgic reaction to one another. PVC wasn't an option due to the heat. So, I wrapped the drain pipe with a ton of teflon tape, then put plumbers pipe dope on that, the screwed the drain on.

I did have to remove the manifold to get it on, so there is that.

The blue did on the drain plug is the pipe dope. It didn't work.Click image for larger version. 

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