How to Make a Spray Bottle That Works in any Direction/Position

Step 4: Attach the Weight at the End of the Suction Tube

The last part to add is a weight on the end of the suction tube. I chose to use 1/4 inch stainless steel nuts because they were readily accessible and because they conveniently fit on the flexible tubing without any adhesive. Admittedly, these are not the ideal objects to use as a weight for this kind of design because they will eventually rust. So if you use steel nuts as your weight, you will want to remove the sprayer assembly after each use so that it can dry out. Alternatively, if you have access to something that is small, dense, and won't react with the liquid, you may wish to use that as a weight instead.

The number of nuts that you will need to use will be determined by the stiffness of the flexible tubing. You want there to be enough weight on the end of the tube so that when the sprayer is turned upside down, the end of the tube will hang near the level of the screw cap. Twist nuts onto the end of the flexible tubing one at a time. After adding each one, turn the sprayer upside down and check how low the end of the tube hangs. This is the minimum level of liquid that will still submerge the end of the tube when held upside down. Continue adding nuts until you are satisfied with this level. I used five nuts in my prototype.