Feature: 1. The pneumatic pressure switch is used on the air compressor to adjust the start and stop state of the air compressor, and the air compressor is stopped and rested by adjusting the pressure in the air storage tank. 2. The product has a maintenance effect on the machine, preventing the machine from running all the time, causing the machine to be easily damaged 3. Reasonable design, the product has a high safety factor 4. Made of high quality iron, brass and plastic material, durable and long service life 5. The bottom thread is G1/4" which is simple and easy to connect Specification: Item Type: Air Pressure Automatic SwitchModel: FB-31, 3-phase 380V, 4-way Material: Iron / Brass / Plastic Color: Black Drive Mode: Electric Rated Current: 20A Pressure Range: 0.8MPA Thread: G1/4" Description: The pressure switch is used on the air compressor to adjust the start and stop state of the air compressor. It can stop the air compressor to rest by adjusting the pressure in the air storage tank, which has a maintenance effect on the machine. During the commissioning of the air compressor factory, adjust to the specified pressure according to customer needs, and then set a pressure difference, for example, the compressor starts to start, pumps up the air storage tank, and the air compressor stops or unloads when the pressure is 8kg. Package List: 1 x Air Pressure Automatic Switch