This is the heater, water bypass hose for 1997-2009 Chevrolet Topkick T6500, T7500, and 2004-2009 Chevrolet Topkick T8500 vehicles. This item is a blue colored silicone hose. Replace your old, leaking, or faulty hose with this brand new factory original part from General Motors at a fraction of the dealer price.

New. Never Installed. OEM Part. Bulk Overstock

GM Part # 15987042 (number on the item)

Item is number 10 in the GM diagram