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DEF CapsFuelDefend BluCaps! locking diesel exhaust fluid (DEF) tank caps defend against DEF contamination and sabotage. Keyed-alike options are available for your fleet.



Prevent the risk of accidental contamination or sabotage with a non-corrodible locking DEF cap. Just 1gal of fuel or other fluid in an DEF tank could cause $3000+ in replacement and repairs.

  • Non-corrodible
  • Zamac-coated locks
  • ISO Approved
  • Two Year Guarantee
  • Models for all major vehicles

To find products to match your vehicle click here   

DEF Caps