Normal
Also I finally found this installation instructions on Asetek site, they have a note the Ring is only needed for Gen4 pumps, since the 645LT is a Gen6 pump, I'm pretty sure you can just toss that retention ring. "Step 3 Secure retention ring to the pump / block combo. Attach from the side that will contact the CPU. Swivel and click into place. NOTE: For Asetek Gen4 pumps, use the plastic retention clip to secure the pump to the retention ring after it is placed in the desired orientation"[URL unfurl="true"]https://www.asetek.com/manuals-and-installation-guides[/URL]
Also I finally found this installation instructions on Asetek site, they have a note the Ring is only needed for Gen4 pumps, since the 645LT is a Gen6 pump, I'm pretty sure you can just toss that retention ring.
"Step 3 Secure retention ring to the pump / block combo. Attach from the side that will contact the CPU. Swivel and click into place. NOTE: For Asetek Gen4 pumps, use the plastic retention clip to secure the pump to the retention ring after it is placed in the desired orientation"
[URL unfurl="true"]https://www.asetek.com/manuals-and-installation-guides[/URL]
