Standard Wall Tube - 14mm x 1.2mm (64) - Pyrex - Borosilicate Glass - 33 COE
14mm to 18mm Showerhead Glass Bong Downstem – Purr Glass
PrimoChill 14mm OD (1.5mm wall) Rigid Borosilicate Glass Tube – 2 x 37 – PrimoChill - KEEPING IT COOL
G Pen Hyer Glass Water Pipe Adapter | Vape Replacement Parts - Pulsar – Pulsar Vaporizers
18mm Male Slide - Assorted
Glass Tubing — Eisco Labs
Amazon.com: MECCANIXITY Acrylic Pipe Clear Rigid Round Tube 14mm(9/16") ID 18mm(0.7") OD 10" for Lamps and Lanterns, Water Cooling System 2pcs : Industrial & Scientific