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Locking DEF Cap

This locking DEF Cap prevents tampering, possible contamination and/or theft of the diesel

exhaust fluid (DEF) on heavy duty trucks.  Models vary by truck type and are shipped with a set of keys.



For more information on the DEF Cap Defender, including pricing and truck applications, 

click on the pictures above or visit


(NOTE: You will be redirected to Freight Defense to place an order and complete the checkout process) 

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