FTA-C-81 Non-Locking Diesel Fuel Cap, 1 Cap Vented caps designed with pressure relief. Safety chain and crossbar included. Description: Female, Vented, LockingAcross Threads (Cap): 3-3/8 Inches Threads: 5-1/2 Per Inch Finish: AluminumApplication: Kenworth or any truck with diesel fuel tanks with 3-3/8" filler necks.Heavy Duty Locking Cam.
For locking cap see FTA-C-97
For Anti-Siphon Tube use FTA-25-7