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 How do I use the control panel? How to remove the thermostatic cartridge Which way do the hot and cold water connections go? My Speakers make a buzzing sound. E4 Error Message Comments 0 comments Please sign in to leave a comment.