Upper Coolant Pipe for 2011-2016 LML 6.6L Duramax Radiator Pipe | SPELAB

Upper Coolant Tube For 2011-2016 LML 6.6L Duramax Coolant Pipe Kit

The SPELAB Upper Coolant Tube is a premium upgrade designed to replace the factory plastic and rubber upper radiator hose on your 2011–2016 LML 6.6L Duramax. Built from high-grade 6061 aluminum with heavy-duty multi-ply silicone couplers, this system eliminates the failure-prone OEM parts and delivers long-lasting durability, clean aesthetics, and improved cooling reliability under heavy load or tuned conditions.

LML Upper Coolant Tube Key Features

• 6061-T6 Aluminum Construction
  Mandrel-bent aluminum tubing resists heat, pressure, and aging far better than OEM rubber.
• CNC-Machined Thermostat Housing & Radiator Adapter
  Ensures a perfect leak-free connection and long-term durability.
• Powder-Coated Finish (Multiple Colors Available)
  Durable, corrosion-resistant coating adds a premium look to your engine bay.
• Direct Bolt-On Installation
  No cutting or fabrication required — designed as a direct replacement for your factory upper coolant tube assembly.

Upper Coolant Tube Specification

What's in the BOX?

• 1 × Aluminum upper coolant tube
• 2 × Silicone couplers
• 4 × Stainless steel T-bolt clamps

This Upper Coolant Tube Fit:

• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel GMC Sierra 3500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 2500 HD
• 2011-2016 LML 6.6L Duramax Diesel Chevrolet Silverado 3500 HD

Video about LML Upper Coolant Tube

Reduce engine operating temperature through modifications (by approximately 20–25°F ≈ 11–14°C)!

Performance UpgradeInstallation Guide

OE = Weakness → Aluminum Coolant Tube = Improved reliability + Prevention of major failures

Failure PreventionInstallation Guide