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XD344 XDP Billet Coolant Block-Off Plate - GM 2011-2017

SKU: XD344
Put the XDP Billet Coolant Block-Off Plate in your 2011-2017 GM 6.6L Duramax to permanently eliminate coolant leaks from the rear housing on your LML and L5P engine.

PRODUCT DETAILS (click to expand)

Mftr. Part# XD344
Weight (lbs.): 1.00 lbs.
Dimensions: 3.00" x 7.00" x 4.00"

PRODUCT SPECS (click to expand)

Product Type Coolant Block-Off Plate
$85.95 (CAD)


The factory cover uses a gasket and over time the plate can warp, and the gaskets can corrode causing coolant leaks.

The XD344 is made from CNC-machined billet aluminum and features a built-in o-ring seal for a leak-free installation.

Each coolant block-off plate comes with a black anodized finish and is ready to install re-using your factory hardware.


  • Built-In O-Ring Seal
  • Black Anodized Finish
  • Billet Aluminum Construction
  • Eliminate Rear Housing Coolant Leaks