GearWrench 3788 Universal Brake Bleeding Adpater with 3.25-Inch Diameter Since our 1919 beginning, KD Tools has been driven by innovation. From our first specialty tool, the Model-T valve spring lifter, to our latest Ratcheting Puller, we've built our reputation with tools that make tough jobs easy. That's why we are the first choice for thousands of automotive technicians worldwide.