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14. Place an o-ring into the groove inside the bottom of the test cell.
15.
Place the screen on top of the o-ring with the flat side facing down.
16. Place another o-ring on top of the screen.
17. Screw the bottom cell cap into the cell and tighten completely.
18. Screw the valve stem into the hole in the bottom of the cell cap. Make
sure the valve is closed by tightening it completely with a wrench.