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$7.99
Step a 14mm joint up to 18mm.
This 14mm to 18mm glass adapter insert is a clear 14mm male to 18mm female adapter that makes the joint on your piece one size bigger. The 14mm male end seats into a 14mm female joint, and the 18mm female opening on the other side takes 18mm male bowls and accessories.
Reach for a 14mm to 18mm adapter when the bowl or banger you want is bigger than your piece’s joint: a 14mm joint and an 18mm accessory. It opens up the full range of 18mm bowls and downstems. Not sure whether you need 14mm or 18mm? Our bong bowl size guide breaks down 10mm, 14mm, and 18mm.
Check your joint before you order: this adapter needs a 14mm female joint on your piece.
✅ Why Choose This Glass Adapter Insert?
The simple way to make a 14mm joint fit the 18mm gear you already own.
Which end goes where? The 14mm male end goes into a 14mm female joint on your piece. The 18mm female opening on the other side takes 18mm male accessories.
Can I use an 18mm bowl on my 14mm piece with this? Yes — once the adapter is seated, the opening is an 18mm female joint, so an 18mm male bowl fits.
Does it work in reverse, 18mm down to 14mm? No — it makes your joint bigger, never smaller. To go the other way you need a step-down adapter; you’ll find them in our glass adapters category.
Last Updated: October 6, 2026
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10mm 14mm 18mm |
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Clear Black Blue Green |
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Clear Teal Blue Green |
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