Tired of plastic oil filter caps seizing, fraying, or breaking when you remove them? This aluminum cap will solve those problems and enhance the look of your engine. Our aluminum oil filter cap has a 1/8″ NPT pressure port that's designed to work! Unlike some competing products, we've machined this cap to function like the factory cap. It allows oil to reach the top of the cap so the pressure port works and also allows the factory oil bypass valve to function.