Originally Posted by supersuby2
I'm thinking its the drain plug on the bottom but not 100%. Im gonna take pictures to compare the stock VS our cheap ebay units to show others that are considering it too
The petcock is the drain valve, Its just the technical term for it.
I'm going to order one of the Ebay radiators soon. My upper mounts snapped off of mine in an accident and they wont cover it. I'll let you guys know how it goes.