Two-Way Stopper Connector for 12mm Air Tube

Design preview. Rendered from the file, not a photo.

The maker says it fits: 12mm air tube. See the proof

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What it does

Shaped for 12mm air tubing so it fits your existing pneumatic lines
A two-way branch design, so you can split one air line into two paths
Printed in PLA to order in the USA after you order
Simple stopper shape made for terminating a 12mm tube run
Compact connector shape that works alongside other tube fittings

Workshop tinkerers and pneumatic hobbyists often need a way to branch or stop a 12mm air line without buying a whole new fitting kit. This two-way stopper connector gives you a simple shape built just for that job.

The connector is shaped to fit 12mm air tube, with a two-way branch that lets one line split into two directions. The design keeps the shape plain and functional, so it works well in a small pneumatic setup or a larger tool bench with several tubes running side by side.

It is printed in PLA and made to order in the USA after you place your order. This item is designed by geezmolycos, and this listing is not affiliated with or endorsed by any tubing or pneumatic hardware brand.

1.6k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: 12mm air tube

That is the maker's word, not a fit we measured. Check the size below against your own.

12mm air tube (model 12mm)From the maker's own listing title, checked 2026-08-13. See the original post

What you get

This design has 4 separate printed pieces.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.