Brass made 3 way switch way, installed on hydraulic valve for AUTO-OPEN-CLOSE This brass made 3 way valve has 3 positions to select different control ... , which can pass water, oil, gas, etc. The other 3 outlets are 1/8" female to connect command tubes. When ... is 10 bar.Basically, this valve is for hydraulic valve to select functions like pressure reducing, electric, floating, etc. 3 way valve