18mm Borosilicate glass J Hook. These J Hooks are very well made and sturdy. They work great with any 18mm adapter or bowl
The cooling from this pipe is very good. The pipe can be easily cleaned with hot water from the faucet.
The smaller 18mm J-hook is also surprisingly effective at cooling vapor
G02 18mm J Hook
Simple and perfect. I think this is a must have in even a small collection.