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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. Check position of diaphragm visually.
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.
1. Harmonic resonance between the 2nd stage This “honking” effect in the second
lever assembly springs, and the mass of the stage can be lessened by installing one
diaphragm. of Sherwoods new denser black
diaphragms shipped under the same
4006-13A part number as the older
blue diaphragm (available since 1997).
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