Not to mention, that the two pins are spaced a distance apart that is for oxygen, notrogen will be a different difference, or a little they might only have one.
Now being in the medical world, to aerorate your wort, this is what you should be using, not the mechanism that you buy and get your bottles that are the size of blow torches because, this o2 is EXTREMELY highly regulated, and healthy. It will not contaminate what you have. The small bottles are not filled under sanitary conditions, and are not really $100 but maybe $30 or so.
What you got there is a D tank and to calculate the duration of the flow you use the formula (never let it fall below 300 - 500, as it will allow for contaminants to enter the bottle. Bottles are normally filled to 2000 psi, and never ever never ever use a petrolium based lubricant near or on the o ring... fire triangle heat, oxygen, and fuel.... If that baby is on an there is enough heat, look on ebay for new eyebrows.)
Here is the formula...
duration of flow in minutes = (gauge pressure - safe residual pressure) x constant
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flow rate in liters per minute
constants:
D cylinder 0.16
E cylinder 0.28
M cylinder 1.56
H cylinder 3.14
So for example you run the regulator in your batch to aerorate your batch, and at 10 psi, which is PLENTY enough
you should get
(2 000 - 500) x 0.16 = 240
then 240 / 10 = 24.
So you should get 24 min. But 10 lpm is PLENTY, when we have a patient on the stretcher unless they are not breath well they are usually at 4-6