IBM OpenCAPI Installing And Servicing page 24

Figure 8. Inserting the OpenCAPI cable into the interposer
11. Using your labels, replace any plugs that you removed from the rear of the OpenCAPI PCIe adapter.
12. Install the air baffle (A) onto the interposer.
Use four screws (0.16 in, 4 mm in length) at (B), secure the air baffle to the interposer.
10 Power Systems: Installing and Servicing the OpenCAPI adapter support for the 8335-GTH system