Does anyone know…

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OP
Z

zografoo

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Location
NorCal
# of dives
5000 - ∞
what the hole is for on this old 1/2 inch, “o”-ring “J” valve? The hole is in the threads, below the “o”-ring and connects to the dip tube.
Thanks in advance,
Z
 

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what the hole is for on this old 1/2 inch, “o”-ring “J” valve? The hole is in the threads, below the “o”-ring and connects to the dip tube.
Thanks in advance,
Z
It allows any air pressure in the tank to vent before the remaining threads are unscrewed. This prevents the valve becoming a missile if removed under pressure.
 

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