Is that red paint and then its etched down to the brass?
Probably Syrian rig....I ve been out of the game for a bit now though, so my hookah knowledge is dwindling.
I was going to suggest teflon tape and o-rings, both of which have been said. Just stop by a home depot, lowes, menards, ace, etc and pick em up.
Otherwise, if you can find some food safe, FDA/USF approved caulk like RTV102 or 108. RTV bonds to most things I m pretty sure... It won't bond to like polypropylene for example though.