Looking into installing a above ground reduced pressure backflow preventor for my irrigation system. Looking at many examples and videos online, I saw different types of piping from PVC, Copper and Galvanized Steel used for the above ground installation like the picture below. My main concern is protecting the potable water and having a long term system.
My question is, which type of piping is appropriate for having this backflow preventer outdoor and under the sun?
- Copper - I heard can deteriorate over time.
- Galvanized steel - can build up rust inside the inner walls over time
- PVC - Not good for outdoor and sunlight