S&B Filters aluminum base crankcase breather filters are designed for a direct mount by simply pressing the aluminum valve stem into the rubber grommet on your valve cover. Designed to work on engines, transmissions as well as oil and gas tanks, these filters are the perfect solution for your crankcase ventilation needs. Available with 3/8", 1/2", 5/8", 3/4" or 1" OD aluminum valve stems with your choice of a polished chrome top or black rubber top.

Over 30 years ago S&B Filters started with a simple mission - "to become a manufacturer of the most technically advanced high performance filter on the market." Their commitment to the race community allowed them to develop products that featured incredibly high efficiency ratings and tremendously low air flow restriction.

S&B busted knuckles with the best engine builders of the day to deliver a product that supplied what they were craving - a filter that delivered performance advantages without sacrificing engine protection. They succeeded by keeping their production capabilities on the front-edge of technology, and never, ever wavering from their goal of producing a high performance air filter that tests better than any other manufacturer. And even today they are pushing the other manufacturers to test to their standards.