Napa Air Filter 9978Part No. 9978 Type AIR FILTER Brand NAPGLD Unit of Measure EACH Description Napa Air Filter Warranty Service Interval Type Round Height 251mm Inner Diameter Bottom 65. 8mm Outer Diameter Bottom 116. 1mm Outer Diameter Top 116. 1mm Features A Nationwide NAPA Warranty backs this Air Filter Prevents microscopic dust particles from damaging Cylinder walls, Pistons and Piston Rings, which could damage an Engine's performance. NAPA Air Filters combine all