Air Release Plug with O-Rings The FatSac Air Release plug makes it easy to purge air from your wakeboard ballast bags without spilling any water. The Air Release plug is a direct replacement for the standard ballast plug used with FatSac wakeboard 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. FatSac ballast fittings have been designed with you in mind. All of the fittings make connecting pumps and hoses to your FatSac Ballast Bags a quick and simple task. No more struggling with old waterbed valves and water spilling inside the boat. Simply twist, pull, replace and you're ready to go!  Features: * Air release plug * Turn to release air * For manual filling, not for venting automatic systems *Sold as an Individual Warning [https://productimageserver.com/prop65/6pt.png]WARNING: This product can expose you to chemicals including Diisononyl Phthalate (DINP) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov [http://P65Warnings.ca.gov].