Installation Note: When installing these just install them finger tight, do not use a wrench or over tighten as you can crack the fitting.
- Metal grip inside
- Allows for PTFE to pass through
- Holds on to tubing strong
- Commonly Used on Extruder side
- CR-10
- CR-10S
- Ender 2/3/4/5
- Alfawise U10
- And more (see below)
- If using these with a “MK8” style extruder with a gap between the feed gear and the PTFE tube you will need to close that gap or your PTFE fitting will be damaged.
- MK8 Printed Gap Closing Part: https://cults3d.com/en/3d-model/tool/mk7-mk8-extruder-filament-guide
Size – Check your existing fitting

Warranty Information
3 Months Warranty -Â Our warranty covers any and all defects with the product. If your product fails or has problems within the warranty period you can contact our support team by using the Contact Us link. Technical support is limited to the scope of the product itself and not your entire machine.
Damage/Failure due to improper installation, improper usage, failure resulting from an issue with the machine the product is installed on, 3rd party products connected to our product, and/or modification of the product are not covered under warranty.
Andrew Esquivel (verified owner) –
I’ve gone through all those cheap pneumatic coupler out there, and they ALL tear apart the bowden tube. I’ve seen tubes prolapse themselves, causing choke points, i’ve had filament pierce the tubes where they connect at the coupler, I’ve seen it all. Those cheap ones don’t even release the tube when you depress the top.
But finally, i found a set that doesn’t do any of that but still grips hard. The difference is night and day. The price you pay here is well worth it. No more broken bowden tubes.
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Collin Aldridge (verified owner) –
If you’re looking to replace the trash stock coupler on your CR-10 is this the way to go. Had an issue where the PTFE tube would slide around inside the coupler leading to filament oozing. After installing this new part, the tube stays in place and the filament retracts properly. Highly recommended.
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