Originally Posted by
BlueAqua
Both reasons actually. I was hoping I'd get lucky and the barbs would align, but they wouldn't. Since the Swiftech GTZ and chipset block have a recessed o-ring there is a gap that needs to be filled. With only one O-ring the metal is pressed right against the derlin, and I doubt the O-ring is compressed at all. So an extra O-ring not only ensures it'll seal but also provides a little more play so I could align the barbs. It worked out really well I have to say. We'll see if it leaks or not since O-ring to O-ring isn't necessarily a good thing.