See more: Dipstick
Chrome hex Knuckle nut style
Colony duplicates or custom style oil filler caps with dipstick, come complete with gasket or o-ring. Available for E & EL 1936-1940, U, UL, UH & ULH 1938-1947 and F & FL Big Twin 1941-1964. Also suitable for other oil tanks with 1 1/4"-12 thread.