FLEECE FPE-LML-CP DURAMAX LML REAR ENGINE COVER COOLANT RETURN PLUG

Clean up the back of your LML engine with the FLEECE FPE-LML-CP DURAMAX LML REAR ENGINE COVER COOLANT RETURN PLUG. This billet aluminum plug is designed to cap off the unused coolant return port on the rear engine cover—perfect when upgrading to a Fleece CP3 conversion or custom coolant routing setup. Its O-ring seal ensures a leak-free fit and clean appearance. Fleece LML coolant plug, Duramax coolant return delete, LML rear cover plug, billet coolant cap, Fleece Performance FPE-LML-CP, CPP Diesel Fleece Duramax upgrades

Features

• Precision-machined billet aluminum construction
• Seals unused coolant return port on LML rear engine cover
• Includes high-quality O-ring for leak-free operation
• Ideal for CP3 conversion or custom coolant configurations
• Made in the USA by Fleece Performance Engineering

Fitment

Engine: 6.6L Duramax LML (2011–2016)
Applications: Used on 2011–2016 GM Silverado and Sierra 2500HD/3500HD equipped with LML Duramax engines
Position: Rear engine cover coolant return port

Cross-Reference / Related Fleece Items (CPP Diesel)

• FLEECE FPE-CP3K-KIT-LML (CP3 Conversion Kit)
• FLEECE FPE-LML-MECHKIT (Mechanical Fuel Pump Kit)
• FLEECE FPE-CP3R10 (10mm Stroker CP3 Pump)
• FLEECE FPE-LML-FIK (Fuel Injection Line Kit)

This billet plug seals off the unused coolant return port in the rear engine cover when modifying or deleting factory coolant routing on LML Duramax engines.

Yes—if you’re installing a CP3 conversion kit, the OEM coolant port is no longer needed. The Fleece plug cleanly seals it off and prevents leaks.

Yes, as long as the O-ring remains in good condition. Replacement O-rings are standard metric sizes available at any hardware or auto parts store.

Machined from high-quality billet aluminum and anodized for corrosion resistance and long life.

California Proposition 65 warning applies; see below.

Specifications for FLEECE FPE-LML-CP