A method for determining existence of a borehole fluid control event by controlling formation pressure during the drilling of a borehole includes selectively pumping a drilling fluid through a drill string extended into a borehole, out a drill bit at the bottom end of the drill string, and into an annular space between drill string and the borehole. The outer tube is also surrounded by a protective tube to be fixed in the motor vehicle. For example, when worn by a right handed user, the bottle pocket, which is on top of or near the ball pocket is easily accessible to the wearer’s left hand. The air supplying device includes a valve housing having two check valve members disposed in a recess and a depression, and a membrane attached to the valve housing and forced by the pump to actuate the check valve members.