"By turning the color-coded lever to “open” you lock open the valves in both the female body & the male tip, so they are unaffected by rapid variations in fluid flow. " "But, inadvertently turning the lever to open without a male tip in place will not result in oil flow. Valves will close automatically in case of breakaway. " "In the closed position the 9250 shuts off oil flow at the remote outlet. This allows for easy, sprayless, zero-pressure connecting or disconnecting and for additional safety when working on an implement. " Levers are color-coded to identify Raise and Lower lines.