Switches include water tank drain switches, fuel tank drain switches and oil supply switches. Caused by the leakage of the switch type: ball and seat serious wear, or impurities, or the ball is not tight with the seat cone surface; seal ring damage; screw slide loose, or rust. Method of exclusion: (1) Replace the worn ball or ball seat. (2) Remove impurities and rust spots between the ball and the seat. (3) Replace damaged seals. (4) Tighten the nut or replace the nut. Large Mesh Belt Drying Machine Drying Machine,Belt Drying Machine,Food dryer machine,Mesh Drying Machine Zhucheng Tongxi Commercial And Trade Co.,Ltd. , https://www.blackgarlicgroup.com