I have an irrigation system which I need to connect air compressor to. I was told by previous owners that there is an entry somewhere around the area pictured below. I assume it is either in one of the boxes pictured, or under rocks somewhere nearby.
Contents of each of the boxes are below.
Questions I am trying to find answers to are:
- Where can I connect air compressor to? Is it in one of the boxes, or somewhere nearby? If it is not in one of the boxes, where would I look for it? It seems like it has to be between #2 and #3, or #3 and #4.
- Should I do anything to the double check backflow preventer for the winter?
- What is #5? It might be unrelated to the irrigation system.