What is the middle pipe for on the water valve? Customer Support February 23, 2021 15:42 This is where you connect the water to the steam generator. Please ensure you use only WRAS approved hoses or hard plumbing, never fabricate a pipe as this could fail under pressure. Related articles Steam generator letting hot water out of steam outlet. Where is the hot and cold feed connection? My control panel flashes a tap, what does this mean? Can I use any essential oil in the system? My Shower drips constantly after use? Comments 0 comments Please sign in to leave a comment.