I had a call today from a customer that asked us to come out and Fix their Backflow Preventer. I asked them to send me a couple of pictures. I was all to happy to help. I can’t fix this. The installation is incorrect. The Wilkins 375 3″ is not approved for installation vertical flow up. It is not even approved for vertical installation. The Client told me that this was approved by a plumbing inspector in a city somewhere in Texas. The customer is in the process if installing outside the building and in a Horizontal orientation.