WE WERE INSTALLING A SUCTION SIDE LINER ON THE GRAVEL PUMP. WE UNBOLTED THE LINER FROM THE DOOR, LIFTED ON THE DOOR W/THE CRANE & THE LINER WAS STUCK. WE PRYED ON THE LINER & THE RUBBER GASKET CAME LOOSE. WHEN I REACHED UP TO GRAB IT, THE LINER FELL FROM A HEIGHT OF ABOUT 3' ON MY FOOT.