DEF Tank Caps

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40mm DEF Cap


Ships FREE in the Continental United Statess


60mm DEF Cap


Ships FREE in the Continental United Statess


60mm Locking DEF Cap





Locking DEF Cap - DEF Cap Defender - International/Mack/Volvo/Navistar


Ships FREE in the Continental United Statess


Locking DEF Cap - DEF Cap Defender - Izusu/Hino


Ships FREE in the Continental United Statess


NOTE: These caps DO NOT fit pick-up trucks or smaller duty vehicles. These are ONLY for heavy-duty sized semi trucks. If you are looking for a DEF cap for a pick-up truck, try a local auto parts store. These will NOT fit. 

DEF Tank Caps

Federal regulations and increased use of diesel exhaust fluid (DEF) in commercial trucks has created an additional layer of maintenance for drivers on long hauls. While DEF helps increase fuel efficiency, it can also create potential issues in the exhaust system. DEF tank caps from Bud and Tony's Truck Parts provide the protection needed to secure the intake area and prevent spills, overflows and leaks.


Durable and Reliable DEF Caps for Trucks

We manufacture our own line of DEF tank caps to meet the highest quality standards in a modern 30,000-square-foot facility in Romeo, MI. Our caps are corrosion-proof and weather-resistant for lasting dependability in the harshest operating conditions. Models feature a distinctive blue color for easy identification and a special tether to ensure it's always close at hand and never gets lost.


Choosing the Right DEF Truck Caps

Bud and Tony's Truck Parts provides non-locking and locking caps for DEF tanks of virtually all makes and models of class 6, class 7, and class 8 semi trucks (excluding Mack and Volvo). We offer 40mm and 60mm DEF caps based on the specifications. If you want extra protection from theft and tampering, our locking caps for DEF tanks help secure access and improve your bottom line.

Shop our online selection to find the products that best fit your vehicle and needs. If you're not sure which DEF tank caps you require, let us know, and we'll provide the information needed to make an informed purchasing decision.


Partner With Bud and Tony's Truck Parts for DEF Caps

We are a leading market supplier of truck parts and semi truck accessories, delivering quality products and services to protect customers' assets and maximize safety and productivity. Our experienced team is here to answer your questions and identify the solutions that make the most sense for your business. Whether you're an independent owner/operator or a purchasing decision-maker for a large commercial fleet, we offer a high level of customer service and attention to detail.

Additional reasons to choose Bud and Tony's Truck Parts for non-locking and locking DEF tank caps include:

  • Premium-quality aftermarket DEF caps priced to fit any budget
  • Secure shopping and online checkout
  • Quick turnaround with products shipping within 48 hours
  • Knowledgeable and attentive customer service and after-purchase support


Place an Order for DEF Caps Today

We're proud to be a source of products that make life on the road safer and more comfortable while protecting trucks and cargo. Make sure you use diesel exhaust fluid efficiently and in line with governmental regulations by ordering DEF tank caps from Bud and Tony's Truck Parts.

Contact us with any questions or to speak with a live representative.