Fleece FPE-LML-CP Rear Engine Cover Coolant Return Plug | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features:

• Specifically designed for 2011–2016 LML Duramax
• Perfect for turbo swaps or EGR deletes
• Made from 6061 billet aluminum
• Durable black anodized finish
• Laser-etched with Fleece Performance logo
• High-temp silicone o-ring included
• Prevents coolant leaks at the rear cover
• Seals securely for long-term performance
• Precision-machined for a perfect fit
• Easy solution for custom engine setups
• Corrosion-resistant construction for durability
• Backed by 1-year limited warranty

Lock Down Leaks Before They Start

If you're upgrading your LML Duramax with a new turbo or finally deleting that EGR system, you’ll need more than just the big parts to do it right. That’s where the Fleece Rear Engine Cover Coolant Return Plug steps in. It might be a small piece, but it plays a big role in sealing off the coolant return port at the back of the engine once those stock components are removed. Fleece built this plug from high-quality 6061 aluminum, finished it in black anodizing, and laser-etched it with their logo for a clean, sharp look that actually adds to your engine bay’s appearance. More importantly, it comes with a high-temperature silicone o-ring to keep things leak-free under pressure. No guesswork, no makeshift fittings—just a straightforward solution that gets the job done. It’s one of those details that separates a quick fix from a solid build, and your truck deserves nothing less.

Engineered To Seal Tight And Stay That Way

The Fleece FPE-LML-CP Rear Engine Cover Coolant Return Plug is precision-machined for a perfect fit on 2011-2016 GM 6.6L Duramax LML engines. Designed to cap off the coolant return port after turbocharger swaps or EGR system deletes, it ensures a secure and permanent seal where factory components used to route coolant. The plug is made from 6061 billet aluminum, chosen for its excellent strength-to-weight ratio and resistance to corrosion in high-heat environments. Its anodized black finish offers added protection and helps it blend cleanly into the engine bay, while the included high-temp silicone o-ring maintains a leak-free connection through extreme temperature cycles. Laser-etched with the Fleece Performance “F,” it’s a subtle nod to quality that serious builders recognize. This plug is more than just a cap, it’s part of a well-executed cooling system that keeps your upgraded Duramax running strong. Backed by a 1-year limited parts warranty, it’s a trusted component for anyone diving into serious performance modifications.

Fitment: 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax 2500HD / 3500HD

Notes:

• Designed for 2011-2016 GM 6.6L Duramax LML engines only
• Intended for use with aftermarket turbo installations
• Also required when performing an EGR system delete
• Not compatible with LB7, LLY, LBZ, or LMM Duramax models
• Includes high-temperature silicone o-ring to prevent leaks
• Machined from 6061 aluminum for durability and corrosion resistance
• Anodized black finish enhances longevity and appearance
• Laser-etched Fleece Performance logo for a clean, professional look
• Should be installed during turbo or EGR upgrade projects
• Backed by a 1-year limited parts warranty from Fleece Performance