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AA Pressure Gauge leak query

Hello all,
I've got air leaking from the little hole (at the bottom of the gauge below) on my s510. I noticed the rifle would lose pressure over a couple of days, and when filling it the other day it suddenly started gushing out of this hole. I assume some small internal seal has broken inside the gauge and that this is the escape hole so it doesn't blow the plastic cover off. Correct? Thanks in advance for your help.
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