steam generator

Hi everyone, I am in the process of installing a steam shower in a 5*5 enclosure. Paying a lot of attention to the vapor barrier (Using Kerdi) My questions are: Vent in the shower enclosure or no?. ... So when the original rough our was done a number of years back, the contractor installed...

Could you recommend where to get inlet and drain valves (1/2" 12VDC normally closed brass valves)? The valve must have an integral bracket (see picture). That bracket gets attached to the steam generator case with two screws, which prevents rotation of the valve when a pipe coupling gets screwed...