AC 220V G3/8" Female Thread Automatic Water Pump Pressure Switch Mechanical Pressure Controllerl for 150W-750W Booster pump The pressure switch is suitable for hot and cold water automatic pump, the other family booster pumps, pipeline pumps, etc. It can automatically control the pump start and stop, simple operation, stable performance, protect the machine, saving power consumption and so on. Max Voltage: AC220V Max Current:16A Material:Zinc Alloy +Plastic Color:Grey male Thread Dia.:1/4"PT Size:86x50mm (total length X outer diameter on the bottom) Pressure range:1.0-1.8 kgf/cm2 On: 1.0kgf/cm2 Off: 1.8 kgf/cm2 Pressure range:1.5-2.2 kgf/cm2 On: 1.5kgf/cm2 Off: 2.2 kgf/cm2 Pressure range:1.8-2.6 kgf/cm2 On: 1.8kgf/cm2 Off: 2.6 kgf/cm2 Pressure range:2.2-3.0 kgf/cm2 On: 2.2kgf/cm2 Off: 3.0 kgf/cm2 Weight: 186g The points of the Pressure adjustments: A Turn on the tap, the water pump or motor does not stop running, switch adjust the pressure bigger; B Shut off the tap, water pump not stop or frequency stop action, adjust the pressure smaller ; C Tuning adjustment, (semi-circle and a half tone ring) try to adjust to a suitable pressure position until the pump is working properly. Package include: 1 x male Threaded pressure switch control