Volvo Mack DEF Tank Cap - Replaces OEM 21148722 21148728 16MF51M

• 100% Guaranteed Fitment: Explicitly engineered as a direct replacement for Volvo and Mack DEF tanks. No guessing or modifications required.
• Direct OEM Cross-Reference: Delivers a seamless fit as the exact aftermarket replacement for highly searched factory parts like Volvo 21148722, Mack 21148728, and 16MF51M.
• Prevents Costly Derates: Creates a perfect, airtight seal to keep dirt, water, and debris out of your DEF fluid, protecting your SCR emissions system from expensive damage.
• Fleet Standard Reliability: Constructed from rugged, chemical-resistant materials designed to withstand the harsh environment of commercial trucking and frequent fueling stops.
• Ready to Install: Stop wasting time cross-referencing—if your original cap matches the OEM numbers provided, this cap will thread right on and get you back to hauling safely.

Don't risk dirt, diesel fuel, or moisture contaminating your Diesel Exhaust Fluid system. A missing or broken cap can lead to severe SCR system damage and put your truck into a costly engine derate. This premium aftermarket Volvo Mack DEF Tank Cap distributed by FleetPro Parts & Tires is the exact drop-in replacement you need to seal your tank and keep your emissions system running flawlessly. Manufactured by Automann to rigorous Fleet Standard specifications, this high-quality cap offers the perfect blend of durability and affordability for commercial fleets. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping so you can get back on the road.

Guaranteed Fitment: The Volvo Mack DEF Tank Cap Advantage

This Volvo Mack DEF Tank Cap leaves absolutely no room for confusion. If you are driving a late-model Volvo or Mack heavy-duty truck, this is your direct-fit replacement. Built from heavy-duty, chemical-resistant plastics, it perfectly matches the thread pitch and sealing requirements of your factory DEF tank to prevent dangerous leaks and fluid crystallization.

At FleetPro Parts & Tires, we know you don't have time to make phone calls just to verify a simple replacement part. You can confidently hit "Add to Cart" knowing this Fleet Standard unit serves as the exact aftermarket replacement for highly searched OEM part numbers like Volvo 21148722, Mack 21148728, and 16MF51M. Seal your DEF tank once and fix it right with this proven Automann solution.

Vehicle Fitment & Compatibility

This heavy-duty aftermarket DEF tank cap features an exact-fit design explicitly intended for the following commercial applications:

• Make/Model: Volvo Heavy-Duty Trucks
• Make/Model: Mack Heavy-Duty Trucks
• Component Group: Emissions / DEF (Diesel Exhaust Fluid) System

Direct Replacement & Cross-Reference Numbers:

This high-quality Automann cap serves as a direct exact-fit replacement for the following part numbers:

• Volvo/White OEM: 21148722
• Mack OEM: 21148728, 16MF51M
• Automann Distributor #: 572.3006

Technical Specifications

• Component Type: DEF (Diesel Exhaust Fluid) Tank Cap
• Material: Chemical-Resistant Heavy-Duty Plastic
• Condition: Brand New
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)