The chamber depth on the '31' is certainly a bit smaller if not the smallest in the 'System' category, but for those fresh Virginia blends, or a real fresh aromatic with a lot of moisture, this pipe can really make the difference. The innovation was to drill out the shank and allow enough space for a longer threaded metal tube to be suspended within. With this design moisture cannot block the airway and cause gurgling, thereby leaving the smoke with a dry smooth quality.
- Chris Johnson