Could someone please tell me the size of the o-ring used inside of the cap on a grand? I used one in the drip well under my RM2 and would like to order a few extra to replace the one I took off my spare 6ml bottle cap. Thanks!!
I'm not sure but would guess 10mm x 2mm. Rob has them on the site for a quarter each if you are ordering something else anyway. this would be the way to go.
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