Coolant Plug for Engine Cover

Features:

• Designed for 6.6L Duramax engine covers
• Billet aluminum construction for durability
• Black anodized finish for corrosion resistance
• Designed for 1.1-inch bore applications
• Includes high-temperature silicone O-ring seal
• Provides a secure, leak-free fit
• Precision machined for easy installation
• Improves engine bay appearance and reliability

Clean Up Your Engine Bay with Confidence

If you’re working on your 2001–2016 GM 2500HD or 3500HD Duramax and want a simple, high-quality solution for sealing off the coolant passage in your engine cover, the Wehrli 100025 Coolant Plug is exactly what you need. Precision-machined from billet aluminum and finished in a sleek black anodizing, this plug is built not just for a perfect fit, but to handle the heat, pressure, and harsh conditions under the hood without corroding or giving up over time. Designed specifically for 1.1-inch bore applications, it installs easily and gives you a clean, professional finish that looks right at home on a serious build.

Built Tough for Real-World Durability

What sets the Wehrli coolant plug apart is its attention to detail. It comes with a high-temperature silicone O-ring seal, ensuring a secure, leak-free fit that you can count on whether you're daily driving, towing, or pushing your truck at the track. No cheap materials, no questionable machining, just a solid, reliable solution that improves both function and appearance in your engine bay. Whether you're upgrading other components, cleaning up a race setup, or just taking care of maintenance the right way, this Wehrli billet coolant plug is a small upgrade that makes a big difference in doing the job right.

Fitment: 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 GM 2500HD/3500HD 6.6L Duramax