The Rain Bird Drip System Operation Indicator Kit rises to indicate water flow when system pressure reaches approximately how many psi?

• A. 10 psi
• B. 15 psi
• C. 30 psi
• D. 20 psi

Answer: (D)

Understanding how the indicator works: this kit is designed to rise only when there’s enough pressure to move its internal mechanism. For drip systems, a pressure around 20 psi is the standard point at which there’s enough flow to clearly show, so the indicator rises to signal that water is actually moving through the line. This makes 20 psi the intended activation threshold, aligning with typical drip system operating pressures.

Lower pressures (10 or 15 psi) are generally not enough to reliably lift the indicator, while a higher pressure (30 psi) isn’t the designed trigger point for this device. So the indicator rising at about 20 psi is the correct behavior.