Autolite SL 30A Aviation Spark Plug Autolite SL 30A Aviation Spark Plug
As fitted to many American radial engines. Check application before buying. These are brand new sealed in plastic tubes, and have the military ref no (?) F41608-75-C-A773. Used also on: IO470D, E, F, H, I, M, N GSO-526, FSO-526, R-9-A and IO470-5.