What is wrong with this picture? The photo shows something we find occasionally when we go out and do sprinkler work or landscaping for clients with existing irrigation systems. See the valves are very pretty. Tucked away in the ground in a box so you don’t have to look at them. Very professional looking, right?
These valves are anti-siphon valves. Anti-siphon valves allow water to only flow in one direction. For irrigation purposes, it prevents water from the system from… being siphoned back into the household water supply line. Essentially, it stops unsafe water from entering a clean water supply such as the water that comes from your faucets or shower heads.
Anti-siphon is a type of Backflow preventer and is an essential part of any plumbing installation which is connected in any way to a potable water source. They are required by building codes everywhere.
The anti-siphon valves need to be installed 6 inches HIGHER than the highest sprinkler head or line. This photo shows a very dangerous situation! The only way this would be OK is if there is a separate Backflow preventer properly installed before these valves.
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