Which component should be used to reduce excessive pressure to sprinkler heads?

• A. Irrigation controller
• B. Pressure regulator
• C. Backflow preventer
• D. Filter

Answer: (B)

The key idea is controlling water pressure to match what sprinkler heads can handle. When supply pressure is too high, heads can mist, spray too widely, or wear out faster, and zones won’t cover evenly. A pressure regulator lowers the incoming pressure to a safe, design-ready level for the heads, helping ensure consistent spray patterns and efficient water use. It’s typically installed on the mainline or at the start of a zone so each head operates within its expected pressure range (often around 30–50 psi for many common heads, with some specialty heads needing different ranges).

The other components don’t adjust pressure: an irrigation controller only manages timing and sequencing, a backflow preventer protects against contamination, and a filter cleans debris. They serve important roles, but not to reduce pressure to sprinkler heads.