None returner valve Home › Forums › Public Forums › General Plumbing › None returner valve This topic has 1 reply, 2 voices, and was last updated 22 years, 1 month ago by oman. Viewing 1 reply thread Author Posts 27 Jan 2001 at 11:55 am #274510 MasterPlumbersKeymaster My question, is that at present I am installing a shower in my home and am wondering do I need a None Return Valve in the main water supply/ water inlet? 27 Jan 2001 at 8:07 pm #289880 omanParticipant no it is not nessecary to install a check valve on this water line.jerry Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In