PPE’s Performance Silicone Coolant Hose Kit is a direct bolt-on upgrade that requires no cutting or modifications. Perfect factory fit with better-than-factory performance. Engineered for performance and durability, the kit features 4-ply heat-resistant internal fibers that provide strength against high-pressures and temperatures. The included TIG welded, polished 304 stainless steel “T” fittings are designed to eliminate any chance of failures at the “T” junctions. This coolant hose kit also features a 5 mm thick silicone is twice as thick as the factory hose to ensure long-lasting performance without sacrificing coolant shuttling effectiveness. Design elements of this aftermarket kit come with a quick-connect/disconnect end is made from billet aluminum and 304 stainless steel and finished with steel clamps to ensure everything stays together. All in all, if you're on the market for a cooling upgrade for your GM Duramax, pick up the PPE Upper and Lower Coolant Hose Kit!