Indescribable !!! I thought so at first, that never works. But far from it. Forget all Luftabsaugpumpen and Bubble-stop! This valve keeps what it promises. ... Used roll off the head of the bed with the whole body to the foot ... and repeat the whole procedure 3-4 times. It's amazing what's coming out of air. And unlike the pump, no water comes with. In addition, you can repeat the whole thing alone, because the valve closes as soon as you get up from bed. It is therefore important at this time in any air. I can recommend it to anyone waterbed owner!
