Features: 1.Sophisticated craftsmanship, this kit is perfect to fit for GM Duramax 6.6L 2004.5?2010. 2.Use these PCV reroute fittings from GRP to eliminate this unnecessary efficiency robbing system. 3.When these accessories are used with the hose you choose, they will allow you to bypass the factory PCV system to improve the reliability of the engine. 4.We recommend using these fittings together with the GRP PCV port plug and the resonator plug to really clean your engine compartment and increase the overall cooling air intake of the engine. 5.Processed with high?quality materials of aluminium alloy, wear?resistant, high?temperature resistant, and have a long service life. Specification: Item Type: PCV Reroute Fitting Kit_x000D_ Material: Aluminium Alloy_x000D_ Fitment: Fit for GM Duramax 6.6L 2004.5?2010 Note: Professional Installation is Highly Recommended (Installation Instruction is NOT Included).