TAG - 30" Straight Tube 50x7MM - 18/14MM Downstem (4.00")

The TAG 30" Straight Tube is a full-size borosilicate water pipe built around one idea: a long, straight column of water and air for a big, clean draw. The tube is made from 50MM diameter glass with heavy 7MM walls, genuinely thick-wall borosilicate that resists thermal stress and the knocks a tall tube invites. A straight tube pulls with low drag, so the draw stays fast and open from the base to the mouthpiece.

The joint is an 18MM female, and it runs a removable 18/14MM reducing downstem. That downstem seats an 18MM male end into the pipe and presents a 14MM female end, so it accepts a 14MM male slide and diffuses the pull below the waterline for cooling before it climbs the tube. Because the downstem lifts out, it is easy to clean and simple to replace. Downstems vary about a quarter inch, so measure your piece before ordering a spare. The sandblasted logo is etched into the glass, so it will not fade with repeated cleaning.

It ships with a matching glass slide. Accessories may be taped inside the bubble wrap, so check the wrapping fully before reporting a missing item. Avoid thermal shock: no boiling or freezing water, let the glass reach room temperature between extremes, and never torch the glass.

• Type: Straight tube water pipe (removable downstem)
• Joint size: 18MM female, accepts the included 18/14MM downstem
• Downstem: 18/14MM reducing, 4.00", accepts a 14MM male slide
• Glass thickness: 50MM diameter tube with 7MM walls
• Height: 30" (slight variance)
• Finish: Sandblasted logo (permanent)
• Included: Matching glass slide

Downstem Fitment Note

Insert lengths can vary slightly between units (±¼–½"). When purchasing replacements, always measure your insert length first.

See the 👉 Downstem Sizing & Measurement Guide.

Made To Order (MTO)

Want a specific color, label, or joint style? TAG offers a long-standing Made To Order program for custom configurations and restock requests.

Learn more at 👉 Made To Order (MTO) or email info@thickassglass.com with your request.

Free 2-Year Limited Warranty

Qualifying 1st Quality TAG glass purchased from thickassglass.com or shop.thickassglass.com on or after October 15, 2026 includes a Free 2-Year Limited Warranty. One eligible replacement within two years after delivery is 65% off MSRP (you pay 35% of MSRP), plus shipping & handling. Quartz, lower-grade items and other brands are excluded. Full warranty terms and earlier paid-plan coverage.