Billet Aluminum finish can be left as is, polished, powder coated or painted Both good looking and heavy duty Meets requirements of 1– 1/2 Pint Transmission NHRA Overflow Rule Prevents fluid mist from spraying on the race surface, back of your car and tires Pressurized fluid is captured in the Expansion tank and will drain back into the transmission as the trans cools (if mounted as instructed) Excess fluid may also be drained between rounds, by using included ball valve Includes breather and billet aluminum mounting bracket (See No. 41222) Designed with an integral baffle Dimensions: 2.750" O.D. , 2.715" I.D., 7.050" long