This rubber cap from Dorman has a 5/8'' inner diameter (ID), making it suitable to cap-off 5/8" hose-barbs and other fittings that are no longer in use. This cap is supplied in Improved Racing's C7 Corvette factory oil cooler system deletion kit.
1 x HPL-1001 - 5/8" ID coolant barb cap
2014+ (C7) Chevrolet Corvette
This cap is a sub-component in the C7 Corvette factory oil cooler deletion kit (Part # HPL-1003-KIT). Capping only the radiator hose-barb alone will not delete the factory oil cooler and will leak coolant from the factory cooler.