Bricks can help!
Valve Box Installation Tips
When you're installing a sprinkler valve box,
sometimes using bricks can help make the valve box sit more
stable. You can also make the valve box look a lot neater by using
crushed rock in the bottom.
Tips from the video:
valve box actually sits above the manifold in the ground
can use bricks at the four corners to prop up the valve box to make
it level and sturdy
crushed rock around the valves at the base of the box to keep
using crusher dust and sand at the base because that can cause
problem with the valves