I haven't tried it but a Milaana stem might work as an 18mm gong.
Only issue might be that the ID is a little bit bigger than UD stems, so it might let too much cool air in. I'd wager that a non issue if you use the high temp O rings though.
The bowl size would be slightly wider/bigger than stock UD stuff too.
Only issue might be that the ID is a little bit bigger than UD stems, so it might let too much cool air in. I'd wager that a non issue if you use the high temp O rings though.
The bowl size would be slightly wider/bigger than stock UD stuff too.