1、Paddle Control: The number of paddles and the length of the trimmed paddles can be adjusted to meet the needs of different pipe diameters and flow rates. 2、SPDT Contacts: When the flow rate exceeds the set value, the fluid pushes the paddle, which drives the top microswitch through the mechanism inside the water flow switch, and the SPDT contact opens one circuit and closes the other. 3、Brass Material: The shell is made of brass, which is strong, durable and corrosion resistant and greatly improves the service life. 4、Fine Workmanship: The water flow switch has exquisite workmanship, no burr, smooth surface, compact size and easy installation. 5、Widely Used: This flow switch can be used in water treatment systems, central air conditioning, water cooling units, etc. It is suitable for water and any other gases or liquids that have no corrosive effect on brass. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.