Nauticam NA-A7II, Инструкция по эксплуатации

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1. After verifying that the main O-ring is in good condition, lightly coat it with the
lubricant provided.
2. Make sure the O-ring groove located in the front part of the housing is free
from any foreign material; the groove can be cleaned with the aid of a
microfiber cloth.
3. Place the main O-ring into the groove by gently pushing it, first at the corners,
then the whole perimeter.