Beduan Pneumatic Plastic Bulkhead Union Fitting 12mm Tube OD x 12mm Tube OD Push to Connect Air Fitting (Pack of 2)

Just as advertised, pleased!

Works as they should. Used to fit a cereal containers. With ptfe tube from the sealed box to the extruder drive

Dot air fittings seem well manufactured and hope they last fingers crossed, awesome price and delivery.

Nicely made unions make crossing an airline through a bulkhead quick and easy. I got these to punch through a plastic project box but there's enough thread on there to get through a quarter inch, easily. No leaks on 6mm OD line. They work well and were reasonable priced.

I grabbed these for use with the 4mm OD PTFE tubing used on my Prusa printer so that I could make a custom rack for holding spools and feed it into my MMU3. These fit the stock tubing perfectly. As far as fit from end to end, thats going to be something each person has to do to taper the PTFE, but this will work and works for me.

Purchased the DIY Filament Dryier, which worked perfectly for the PTFE tubing.

You can find gasketed tupperware containers and use these as bulkhead fittings for 3d printer tubes to keep the filament dry and clean. They screw in from both sides and work well for fitting on both sides of the container.

Fit well