It is 4.1 mm, but that is to the outside with those little fins which give pretty easy. So 4mm would probably work.
Also, a bit more of an hour glass design would be gentle on the BB O-rings and yet give more juice. Like the Diver v2 Enzels (or however you spell it).
I got several things to post, but anxious to finish my DNA 30 box exterior. But the short of it is I drilled out the inside diameter of the chimney cup, which is soldered directly to the upper tube (gutted carto) and that took out the chimney all together. So then I drilled the inside of the tube with a larger diameter drill to chamfer the inside towards the hole. Works really well and will funnel all the juice back down. Only kicker is it really needs a horizontal coil instead of a vertical to catch the juice. Let me catch up and I will post some pics.
Ok so pretty much the same as the Kanger's, good to know. Will have a prototype done by tomorrow and will throw some pics up. A quick spin of a file should knock those fins off it it is too tight.
Dan
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