It's the large O ring that fits on the bottom of the UFS tank block (also called UFS tank bottom, ) - that is the section that you push into the collector tank (lower section). It's a 14x1.5 sized O ring.
http://www.e-cigarette-forum.com/forum/gg/186053-ggts-avs-ufs-user-manual.html
http://www.e-cigarette-forum.com/forum/gg/186053-ggts-avs-ufs-user-manual.html
Hi Dspin,
Which O ring are you talking about?
Chris
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