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C. Wet Breathing:
1. Improper clearing, or diver diving in total Instruct the diver on proper clearing
head-down position. technique.
2. Diaphragm improperly installed. Visually check position of diaphragm.
3. Hole in the mouthpiece at tie area. Replace the mouthpiece.
4. Hole in the diaphragm. Replace the diaphragm.
5. Damaged exhaust valve, or edges of Replace exhaust valve.
the exhaust valve not firmly seated on
the case.
6. Crack in case. Replace case.
D. Humming or Buzzing During Inhalation:
1. Harmonic resonance between the springs Disassemble the first stage and flip the
and the mass of the piston. main spring over. Change the position
of the piston in its bore. If resonance is
still present, install a new piston and
spring.
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