Unless excessive leakage occurs, it is not advisable to replace the o-ring seal from the shank of
the stem. This requires disassembly of the air section.
If removed stem satisfactory, reuse. If not, obtain new stem.
Install by inserting stem (1 3) carefully in a centered and vertical position to pass through o-ring in upper cap.
Install spring (12).
Replace o-ring (14) (P/N 568906-9, part of seals kit P/N 16772) and install plug (11).