Replacing a Zurn Wilkins backflow preventer and new Cu lines

[TimJ2021]

Hi--

I'd like to replace a 975XL. It was previously connected using galvanized lines with two unions on both sides, eventually connecting to 1-1/4 PVC for irrigation.

Yesterday I tried replacing the galvanized with copper lines. I wanted to remove any steel in the flow to prevent future corrosion. So, from the source the path went Copper-> Brass ball valve -> Galvanized nipple -> union->nipple ->elbow->Backflow Preventer->elbow ->Galvanized nipple ->union=>Brass ball valve -> Copper pipe -> PVC inlet. What a mess! Many points for leakage failure and it is difficult to get the unions to seal.

Does anybody have ideas for an alternative connection path?

I'd like to not have to move the PVC inlet since it goes immediately under a concrete walkway.

Help!

Thanks
Tim

 

[GReynolds929]

Swap the galvanized nipples, elbow, and unions with brass, and you'll be good to go.

 

[TimJ2021]

Good suggestion. Here is a picture of the set up now