In a drip irrigation emitter color code, which color corresponds to 2 gph?

• A. White
• B. Black
• C. Red
• D. Tan

Answer: (C)

Color coding on emitter bodies lets you identify how much water an emitter will deliver at a glance, without reading small print. In many common drip systems, colors map to flow rates in a rising sequence, so you can quickly mix and match emitters to meet a zone’s irrigation needs. Red is used for a higher flow rate in this standard scheme, which corresponds to about 2 gallons per hour. That quick-reference color helps prevent using emitters with too little or too much flow for a given area. Remember to double-check the manufacturer’s data for any brand-specific variations, but for this question, red is the indicator for 2 gph.