DEF Cap : OEM ASP-DCL-0301

Seal Your DEF System with Confidence

What Is It?

The DEF Cap (OEM ASP-DCL-0301) is a precision-molded cap designed to securely seal the Diesel Exhaust Fluid (DEF) tank fill port. This small but critical component protects your emissions system by keeping contaminants out and maintaining a proper seal over the DEF reservoir.

Why Choose OEM ASP-DCL-0301?

The OEM ASP-DCL-0301 is engineered to match the exact specifications of DEF tank openings used in commercial diesel applications. Choosing an OEM cap helps prevent unwanted exposure to dirt, dust, and moisture—issues that can compromise DEF quality and lead to emissions system trouble.

Key Benefits

✅ Perfect Fitment: Designed for standard DEF fill necks with OEM-level accuracy
✅ Contaminant Protection: Keeps debris, dust, and moisture out of the DEF system
✅ High-Strength Construction: Made from durable, DEF-compatible materials
✅ Integrated Tether: Attached strap prevents loss during servicing or refueling
✅ Prevents Evaporation and Exposure: Helps maintain DEF fluid integrity over time

Applications

The ASP-DCL-0301 DEF Cap is suitable for a wide range of diesel-powered trucks, buses, and off-road equipment using Selective Catalytic Reduction (SCR) systems. It fits most standard DEF fill ports and is a critical piece of routine maintenance equipment.

Installation Notes

Installation is quick and tool-free. Remove the old or damaged cap, inspect the fill port for residue, and snap the new cap in place. The tether should be securely attached to the tank to prevent accidental loss during use or servicing.

Final Thoughts

The OEM ASP-DCL-0301 DEF Cap is a simple yet essential part for protecting your vehicle’s DEF system. Its secure fit and durable build help safeguard the quality of your DEF fluid—so your emissions system continues working reliably without interruption.