GM Radiator Adapter Fitting Kit

The DERALE GM Radiator Adapter Fitting Kit (Part No. 13035) is a straight 3/8-inch hose barb to 3/8-inch hose barb adapter engineered for General Motors cooling system modifications and custom radiator configurations. This aluminum construction adapter provides a direct, leak-free connection point for redirecting coolant flow in performance builds, auxiliary cooler installations, or radiator bypass setups where factory hose routing requires adaptation.

Machined from lightweight aluminum with natural finish, the adapter maintains full flow capacity while resisting corrosion in typical engine bay environments. The 3/8-inch barb-to-barb configuration accepts standard hose clamp fittings and accommodates 3/8-inch diameter coolant hoses commonly found in GM cooling systems. This compact design—measuring 2.75 x 1.35 x 4.15 inches—integrates seamlessly into tight under-hood spaces without requiring bulky fittings or extensive rerouting. The straight-flow geometry minimizes turbulence and pressure drop compared to angled or stepped adapters.

This adapter is essential for enthusiasts building custom cooling systems, installing transmission coolers, engine oil coolers, or aftermarket radiators on Gen I–V small-block and large-block Chevrolet engines, as well as certain Pontiac and Oldsmobile platforms. It's widely used in street rods, race vehicles, and hot rods where OEM hose routing doesn't accommodate aftermarket components. The adapter provides a reliable, cost-effective solution for bridging hose diameter transitions without fabricating custom fittings.

DERALE is recognized in the cooling systems aftermarket for precision aluminum fittings and thermal management components. This fitting represents the standard choice for GM cooling system modifications among professional builders and serious hobbyists seeking verified compatibility and dependable performance under sustained engine operating temperatures.