5
2.
Fit O-ring (9) over the speech diaphragm and press the diaphragm and O-ring into the front fitting,
black grid first, taking care to ensure that the O-ring stays in place on the diaphragm. Secure with
the retainer for the speech diaphragm, with apron uppermost.
Replacement of Inner Mask
Gently pull the inner mask from the front fitting (7) and feed the rim of the new inner mask into the
groove in the front fitting (7).
Replace the front cover and tighten the two retaining screws (1) evenly.
