Fatsac Air Release Plug
Easily remove excess air out of the ballast bag by simply loosening the fitting.
The Air Release plug is a direct replacement for the standard ballast plug used with Fatsac ballast bags, but allows you to easily "burp" excess air out of the bag by simply loosening the fitting slightly. You don't have to completely remove the fitting from the bag, and you don't have to worry about spilling a lot of water, just loosen to vent, and then tighten back down.
Perfect if you manually fill and drain your ballast bags with a Tsunami pump to ensure you get the maximum amount of water in each bag.