It works well, but the assembly instructions are weak. It was difficult to figure out exactly how to attach the suction hose. It looked like it could fit either of 2 ways, but no, it only fits one way. I had to try it both ways to figure that out. It just friction fits (with an O ring seal), but looked like a screw-thingy might hold it. The screw-thingy hold a cap when not using the unit, but it separates into two parts, implying it does more than simply be a cap. I'm guessing the screw-thingy mSee full review