Let’s play a quick round of jeopardy… what is a common failure point on your Duramax? The HVAC heater hose connectors. PPE has come up with a solution to the factory plastic hose connectors that fail constantly with their Stainless Steel Heater Hose Connector. The connector is designed as a direct-fit replacement and offers unmatched corrosion resistance and durability to last the like of your truck.