Looks great so far
The reason the gate valve is loose is likely due to you having the locking nut on the top side of the support bracket and not the underside. The pre review photos you sent showed the nuts being ontop
We are looking into including a valve for the waste dump but not tube as we could never know how long somebody might want.
Thanks so far for the great review, keep the comments and improvement suggestions coming, it is these that help us build the brand