View Larger Image Hamm Glass – Circular Exo-Diffy Vapor Bubbler #1 Hamm Glass – Circular Exo-Diffy Vapor Bubbler The Circular Exo-Diffy Vapor Bubbler by Hamm Glass features a compact circular chamber utilizing an external 3-hole perc with reinforced stemless design. .. Price: $200.00 2019-07-17T21:45:48+00:00By |Products| Share This Story, Choose Your Platform! FacebookTwitterLinkedInRedditTumblrPinterestVkEmail About the Author: