Backflow Home › Forums › Public Forums › General Plumbing › Backflow This topic has 2 replies, 3 voices, and was last updated 21 years, 9 months ago by Robert Stephen Morton. Viewing 2 reply threads Author Posts 11 Jul 2002 at 2:56 pm #275675 MasterPlumbersKeymaster How do you test a double check backflow preventer? 11 Jul 2002 at 11:49 pm #292686 NotubooParticipant You hire a certified backflow tester (not all plumbers have this certification) and have the work done professionally. This is the requirement in the USA. Hope this helps. 12 Jul 2002 at 6:40 am #292687 Robert Stephen MortonParticipant Even though the water runs backwards down here we still have to be endorsed to test Backflow devices in Oz.regards Bob Author Posts Viewing 2 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In