It is a quick-connect fitting, so you have to slide to brass collar back. If yours is at all like mine, it will work very stiff, so you need to play around with it for awhile. Also, if on the door side port, the only on-off valve is the valve for the fresh water hose - turn on the spray after turning the valve to prevent water from spraying back on you once the hose is released. If on the off-door side, then the outside shower valves will turn the water supply off.