When my house was built, whoever installed the sprinkler system put the valves for all 9 zones side by side in a line just behind my house. Each one is about 3-4" apart, and in total I need a box that is at least 36" wide to cover all 9 of them. But I don't need it to be any deeper or higher than normal.

Currently i have two smaller boxes side by side, but this is not ideal since one of the valves is right where the two boxes meet, and the tapered boxes means there is a gap in between for water/dirt to get in there.

Anyone know best place to get a box that would work for my situation?