You can put the oring on the inside or outside, we put them inside, so you can just put the new one on the outside. Its either a #10 or #16, i think # 10 I'm not 100% sure and cannot findout until I go back to the shop monday. I'd bring the tank with you.
Im very sorry about this, the oring we used was just a little too small on some of the tanks.
CM.
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