T660 show truck - trigger warning

I had the sink drain going to the catch tank that was mounted on the crosss beams that connect the fuel tanks together at the bottom.

then I had a valve on that tank.
It’s just water but I didn’t want it running out at someone’s loading dock or something and they panic because they think it’s fuel leaking .

The catch tank was originally designed as a fuel tank for the bottom of a small boat ,
It was about six inches tall , about 28 inches or so wide , and about three or four feet long .

My father ran a marina and I saw some boats , cabin cruisers or houseboats with tiny showers and got
The idea that I could do that in my sleeper .

get a catalog for boat gas tanks , and you should be able to find what you need .

both of my fresh water tanks and the catch tank were gas tanks for boats .