Dyspnea's 120g tank build

[Dyspnea]

Finally I got my CO2 regulator in the mail.

Heres what I bought, off ebay for $23, shipped



Only one problem, when I bought it, I didn't see this picture.



That little "nub" made it impossible to make a seal against my tank.

So I broke out the dremel, and cut the nub off, just lower than the O-ring. I then used a sharpening stone and ground down the roughness until it was smooth.

I put it on the tank and tightened it up, and It sealed. I turned off the tank and left the regulator pressurized over night. Came back in the morning and the pressure on the guage hadn't changed

Now it's up and running