A housing has upper and lower faces, front and rear faces and side faces. A vertical bore extends through the housing between the upper and lower faces. A horizontal bore extends into the housing from the front face. The horizontal bore further extends to the vertical bore. A ball valve is positioned within the vertical bore laterally spaced from the horizontal bore. The ball valve is rotatable between open and closed orientations. A lock cylinder is located within the vertical bore. The lock cylinder has an exposed end with a keyway. The lock cylinder has an unexposed end with a connector clip. The connector clip couples the lock cylinder and the ball.