ere is a screw on the back of the button with a nut on it. The nut came off. This let the button come off and then the spring holding flow regulator closed stuck in the open position.I serviced all my equipment in December. I clean everything every time I dive. I use a big wash tub and flowing water. My equipment was very clean. That is not the issue. The issue is that the nut under the red button came loose. If the button snaps on to the nut to hold it in place, then the nut could not turn and un screw. But if the button holds onto something else, then it "could" have come loose. But why is the default position of the inflator is the free flow position? That is the danger. It seems a bad design. It should be in the closed position then I could manually blew air into the BCD.