Style CAP1. Used in conjunction with The 'Cooler Bleeder and the Series 2 Adapter. This threads onto the intercooler CAC reservoir found in many Ford vehicles. Used in place of Ford Rotunda special tool RadKitPlus / Tool# 078-00497. See Connection Chart for exact fitments.
Also used on all Magnuson and Edelbrock reservoir tanks, such as what is found on C7 Corvette LT4 TVS2650 kits.
Note: Hand assembled in the USA, there may be cosmetic tooling marks on plug from assembly.