WCFAB 1999-2022 GM Billet Coolant Heater Core Firewall FittingReplaces failure prone plastic factory GM Heater Core Firewall Coolant Fitting Billet direct fit replacement with 5 8" barb connection More resistant to heat and vibration Double O ring seal Clear Anodized finished to resist corrosion Replaces GM AC Delco Part Number 15032062 and Dorman Part Number 800 409 The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. Our made in the USA,