Hello, I have an AIRGAS regulator that I am unsure what is at the bottom of it. I have the IN and out sorted but there is a hole at the bottom that I have no idea what goes there. Any help is appreciated. Not sure how to upload photos.
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Thank you so much, is the pressure relief valve necessary or will it work without it?/is it advised to use a co2 tank without oneNormally the bottom fitting has a pressure relief valve screwed into it.
Got it I’m using this with an aquamax calcium reactor, hopefully I will not run into any problems . Thanks again!My cheap Smith 2 stage does not have one.
As long as the hole is plugged you should be fine.

