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.
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.
The caps incorporate an innovative design we developed and are incredibly easy to use. We even include a cap holder; no more messing with tethers! Unlike other locking caps that are fiddly and tedious, you will find ours a joy to use.
- Three keyed-alike keys. One for you, your spouse, and a spare!
- One locking green anodized, laser engraved, Diesel fuel cap
- One locking blue anodized, laser engraved, DEF cap
- Easy to use black cap holder
2011-2022 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.