Tank Warden™ Pre-Order for ’11-24 Super Duty – Ships April 30th – Free USA Shipping!


  • I Agree to the Pre-Order Acknowledgement *

    By selecting 'Yes', you understand this is for a pre-order, and that Tank Warden™ is estimated to ship on April 30th, 2024. In the event that we cannot meet this date, we will contact you in advance. Additionally, you understand that your billing and shipping address must be identical. This pre-order guarantees your place in line. Lastly, you understand that Tank Warden™ is only for Ford 6.7L Diesel pickup trucks (not cab and chassis) from 2011-2024 that have the factory filler necks equipped.

SKU: Tank Warden Category:


Tank Warden is our industry-leading, USA made, locking cap kit that protects your investment and prevents bystanders from contaminating your Diesel fuel and DEF systems, potentially saving you thousands of dollars in engine and emissions related repairs.


Each cap incorporates a highly manipulation resistant, quarter-turn lock cylinder that is prominently used in the casino industry. We opted to choose a lock that doesn’t use a wafer or tubular design, because those designs are insecure. Other locking caps require a cumbersome lock and unlock process and don’t utilize a real key and lock cylinder; why would you buy a ‘lock’ where everyone has the same key?

The caps incorporate an innovative design we developed and are incredibly easy to use. We even include an easy to use cap holder; no more messing with tethers! Unlike other locking caps that are tedious to use, you will find ours a joy to use.

Kit Contents

  • Three keyed-alike keys. One for you, your spouse, and a spare!
  • One locking green, laser engraved, Diesel fuel cap
  • One locking blue, laser engraved, DEF cap
  • One black cap holder

2011-2024 Ford Super Duty Diesel pickup trucks only. Not designed for cab and chassis trucks. Designed for trucks that have the OEM large, rectangular fuel door/pocket with the two OEM filler necks located within.

We cannot sell the Diesel cap by itself. Kits will include Diesel and DEF caps. 

Each kit is keyed uniquely from other kits, and therefore multiple kits within the same order cannot be keyed alike for multiple trucks. For large fleets interested in identical locksets, please contact us here so we can discuss your requirements. 

Ford and Super Duty are registered trademarks of the Ford Motor Company. Subtle Design has no affiliation with Ford or its partner companies.

Additional information

Weight 340 g


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