Review on ACDelco 172 1213 Original Equipment Cylinder by Robert Hole

Works perfectly. There was no part number on the part or box, but it looked like the original. There is a generic master cylinder suitable for this application available at the same price as this one. So without a part number on the part I can't tell exactly what cylinder I have. So it would be nice if there was a way to make sure it was an OEM part and not a fake.