Are you tired of the plastic cap seizing up and stripping or breaking when you go to remove it? This billet aluminum cap will take care of those issues and dress up your engine bay in the process. Our billet oil filter cap has a 1/8″ npt pressure port that is designed to actually work! Unlike some of the competitors’ products, we machined this cap to function like the factory cap. It allows oil to get to the top of the cap for the pressure port to function and also allows the factory oil bypass valve to operate.