Graphite liner O-rings GC/MS

Does anyone have any experience on how to get these graphite o-rings to properly seal for GC/MS applications?

At an inlet temperature of 50°C, the N2 hovers around 11% and the water at around 1%. When I heat the inlet to 400°C, the N2 is 2.8% and the Water is 0.7%.

I am trying to get a leak free inlet seal (when tuning the MSD at 50°C) since I will be running at final oven temperatures of 400°C.

Any suggestions would be greatly appreciated!

-Tom

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