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The core just screws in and can be removed with a special tool or two small flat blade screw drivers. I think my tank is a 10lb. For pressure I just start with the tank and regulator both closed. Open the tank all the way. Then slowly open the regulator a little till you hear some flowing. I do about 30 seconds of a tiny amount till they get a little wobbly then increase the flow a little more for about 10 seconds. Shut the regulator and tank off and wait several minutes. An instant full power shot of co2 will make the rodents freak out. You want them to fall asleep and pass not choke on c02
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