Specifications:

External threads: 1/2"
temperature: -25~+80 °C
Allowing pressure: pressure 1.75Mpa
Operating humidity range: 35%~90%RH (no frost)
Use temperature: ≤ 80°C
Load capacity: ≤ 10 mA (DC 5V)
Working voltage range: DC 5~18 v
Maximum operating current: 15 mA (DC 5V)
The lowest rated working voltage: DC4.5 5V-24V
Working Range: 1-30 L/min

1- Red IN to positive
2- Yellow OUT signal output line
3- Black GND to negative