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And yes the picture uploaded at 90 degrees

Thanks for the reply. I guess that is my Problem in that I don’t have any connections after the Backflow preventer except for the water drain in my control box. Wondering if I need to have one installed.

I just had a sprinkler system installed in My backyard and after researching it looks like my only option to blow out my lines is to blow through the test cocks on the side but have read you aren’t supposed to blow through Backflow preventer. Is it okay to blow through one of the side ports...