Pressure connection: 6.2mm Internal thread tube or G1 / 8 (optional if the hole) This pressure switch is mainly used in ventilation and air conditioning systems to control the air in the air ducts, as well as in filters, ailerons and fans. They are suitable for air and other non- and non-aggressive gases. This switch is capable of feeling a small change of pressure and widely used to control aerator , to monitor and fan and air conditioning. It is also suitable for protection against overheating and frost protection in the industrial refrigeration system. Due to its exceptional design, the set point can be adjusted visually Electrical connection: screw terminals AMP6.3mm connector; AMP4.8mm connector, Weight: 3.94186524456 Pounds, Manufacturer: Frewurwer