These are similar to our 12 AN water pump adaptors except they are 16 an.  This larger size allows a significantly larger amount of coolant to flow through the engine.  Keeping your engine cool is one of the most important things you can do to improve longevity.  These fittings are anodized blue, they include the sealing gaskets and fasteners.  Like all of our other products, this is proudly made in the USA. 

Disclosure:
Affirm: For personal use. Terms apply.