As the previous reviewer has mentioned, this device doesn't hold together really well. In my experience, this really only refers to the pump cylinder itself. The pump has a collar at the bottom that is pressed down over a rubber grommet that surrounds the neck and one-way valve at the top of the tank. That fitting is a bit loose and requires the user to use both hands to keep the pump held tight on the tank while actuating the vacuum pump. For me this wasn't an issue, as the draw tube stayed secure inside the mower engine, all by itself. But it would certainly be improved by some sort of lock or latch to keep the pump in place.