Billet Technology Sigma Series Radiator Cap Cover Chrysler Dodge Jeep Ram

Give Every Mopar Engine Bay a Billet Aluminum Finishing Touch

The Billet Technology 30015 Sigma Series radiator cap cover swaps out the dull factory plastic radiator cap for a precision CNC-machined billet aluminum piece across the full Chrysler, Dodge, Jeep, and Ram Hemi lineup. Every piece is machined in Lake Worth, Florida from solid 6061-T6 certified domestic aircraft-grade aluminum, giving your engine bay a factory-plus look with the durability Mopar performance drivers demand. No modifications, no adapters. Installs in minutes with zero tools required.

Which Engraving Fits Your Trim

The Sigma Series 30015 ships in five distinct options built around your specific engine, so double check your Hemi displacement before ordering. Choose OEM Replica for a clean, unbranded billet look, or select the 5.7L, 6.1L, 6.2L, or 6.4L engraved version to call out exactly what is under your hood.

Fitment

Specifications

What Is Included

• 1x Billet Technology 30015 Radiator Cap Cover in your selected engraving/finish
• Any variant-specific hardware as shown on the product page

Frequently Asked Questions

Does the Billet Technology 30015 radiator cap maintain OEM pressure rating?

Yes. The Sigma Series 30015 includes a billet aluminum pressure cap insert that maintains OEM spec pressure ratings while replacing the factory plastic housing.

How do I know which engraving option to order?

Match the 30015 variant to your engine’s Hemi displacement, OEM Replica, 5.7L, 6.1L, 6.2L, or 6.4L, so the engraving reflects what is actually under your hood.

Is the Billet Technology 30015 made in the USA?

Yes. All Billet Technology products, including the 30015, are manufactured in Lake Worth, Florida using certified domestic 6061-T6 aluminum.

Installation Instructions

1. Allow the cooling system to cool fully before opening. Never open a hot radiator cap.
2. Twist the factory radiator cap counterclockwise one quarter turn to release pressure, then continue to remove.
3. Install the Billet Technology 30015 by threading clockwise onto the radiator neck.
4. Verify the cap seats fully and the pressure locking tabs engage correctly.
5. Start the engine and allow it to reach operating temperature.
6. Check for leaks around the radiator cap area after the first heat cycle.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.