Style CPR1. Used in conjunction with The 'Cooler Bleeder and the Series 2 Adapter.  This is used for bleeding vehicles without a factory bleed port and that have installed a Cordes Performance Racing / CPR intercooler reservoir ice tanks with 3" fill caps.  CPR has two cap styles, our CPR1 plug fits the newer style, regardless of vehicle application.  This threads onto the CPR tank.
 
Note:  Hand assembled in the USA, there may be cosmetic tooling marks on plug from assembly and variations in welds.