Over time, the lid to your TBB series blender jar can warp due to frequent washings. Replace it with this Waring CAC145 jar lid! This lid is designed to fit tightly into the top of your blender jar to create an airtight seal and prevent liquid from leaking out of the unit during the blending process. In addition, it comes with an embedded measuring cup with fill lines for 1 oz. and 2 oz., the perfect size for bar applications.