Walker Air Filter Oil - Blue - 20 oz. Bottle Pumper Systems chrome moly with a Viton

chrome moly with a Viton seal and anodized aluminum plate

The 5/8" valve stem hole is located behind the center to avoid clipping

Flexible armor plated material

325 in Head

Side A is AN-10

Walker Air Filter Oil - Blue - 20 oz. Bottle Pumper Systems chrome moly with a VitonProduct Description: Air Filter Oil Blue 12 oz Sold Individually Walker Engineering specializes in high performance air filters and accessories for Sprint and Midget cars, as well as other racing applications. Designed and produced in the USA, Walker air filters give racers an extra edge on the track. Walker Performance Filtration is a world leader in innovation and development of high performance air filtration technology.