This bubbler/percolator was designed to fit most 12-14mm flared/tapered female pipe stems and bowls. It measures 40mm diameter, 60mm barrel height, and 77mm overall height. 

The 45 Degree Version has 19mm clearance between the top lip of the tapered seat to the edge of the barrel.

The 90 Degree Version has 10mm clearance between the top lip of the tapered seat to the edge of the barrel.

The diffuser (inside barrel) has 3 large (4mmx8mm) openings for maximum flow and minimal clogging. 

NOTE: DO NOT USE INTERNAL SUPPORTS. This may inhibit airflow or increase clog frequency. Use a Support Blocker inside the main bubbler and on the UPPER HALF of the U-shaped outlet neck. The only part of this build that requires supports is the base of the outlet neck.