PU pneumatic tube 4 to 12 mm OD (push-fit sizes) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pu-pneumatic-tube/  (CC BY 4.0)
Basis: ISO 6432-style metric PU pneumatic tube sizes (4 / 6 / 8 / 10 / 12 mm OD); each file a 50 mm length
Catalog version: 2026-10-20

Sizes: see table below
- PU pneumatic tube, OD × ID: 4×2.5, 6×4, 8×5.5, 10×6.5, 12×8 mm; each file is a 50 mm length at exact OD and ID.
- It is stiff tube made for push-fit fittings, typically rated 10 bar.
- Push-fit fittings grip the tube OD, so the push-fit socket is drawn at the tube OD exactly.
- On my pressurised engines the line is 6 mm PU into push-fits.

od_mm  id_mm  wall_mm
4  2.5  0.75
6  4  1.0
8  5.5  1.25
10  6.5  1.75
12  8  2.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Hose barb — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hose_barb
- Wikipedia: Push-fit fitting — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Push-to-connect_fitting
- McMaster-Carr: Tubing (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/tubing/
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/pu-pneumatic-tube/index.json
API: https://xemstudio.com/api/geometry?object=pu-pneumatic-tube