High-quality material: the base of the pressure switch of the water pump is made of zinc alloy, the thick shell uses high-quality zinc alloy and ABS material, the bottom is equipped with rubber high-pressure washer membrane, which makes it more durable, corrosion-resistant, water infiltration, water leakage, etc. Easy to use: the more the main spring nut is screwed, the higher the start and stop pressure, otherwise it will be smaller. The lower the secondary spring nut is screwed, the greater the stop pressure, which can be used as an auxiliary setting. Automatic working: the pressure of the water pump is automatically controlled without manual operation. Operating parameters: Rated Voltage: 220 V AC, Rated Current: 16 A AC, Thread Type: 3/8 Female Thread, Pressure Range: 2.5-4.0 kgf/cm², Power: 1100 W Scope of application: used for self-priming pumps, jet pumps, garden pumps, water pumps etc.