what does the M on the second stage stand for? :confused:

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S

Sea Spartan

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I am a new diver and I was lucky to get a hold of a poseidon first stage and cyklone regulator.

I am setting the system up and am done exept for one thing: I do not know what to do for the slot with an M on it.

im guessing it is for the octupus but am not 100% sure

any suggetions would be helpful, thank you
 
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