DIY is fun....but,
For $1.59 you can buy one that sprays at any angle AND upside down
New Upside-Down Trigger Sprayer! This innovative trigger sprayer works any any angle. No more frustrating "air pulls" because you need to spray at an angle or upside down. This trigger sprayer will quickly become your favorite and most helpful tool when dispensing tire dressing, all purpose cleaner & glass cleaner. Eliminating frequent bottle refills means more time. More time = more money and a happy detailer.
It works by utilizing a secondary ball bearing float valve, located just under the trigger sprayer neck. When the fluid is on the bottom the primary valve on the bottom pulls the liquid product. When the bottle is turned upside-down, the secondary valve at the top takes over and keeps the product dispensing until the bottle is completely empty. The ball bearing moves to open and close the secondary valve with the gravity of the angle of your bottle.
The trigger also features a comfortable 4-finger handle for a full grip pull and greater hand control. Spray nozzle adjusts to a fine mist spray pattern - excellent for misting tires and windows at an angle.