So, I've been collecting the pieces to replicate 'The Thunder Gun of Witch Finder-General Dalrymple' deployed by Sergeant Shadwell in "Good Omens." I've identified and obtained everything except the chromed valve thingy attached to the gold tank. I was thinking it might be a vintage vacuum quick coupler from a hospital vacuum system, but no luck finding one to match. After hours of fruitless searching I give up. Does anybody recognize it?