Various fittings to convert 1/4″ NPT Industrial Quick-Disconnect to low-pressure tubes 5/16″ and 3/16″. Both male and female tube fittings are provided.
Designed based on official mil-spec MIL-C-4109F and ANSI standard B1.20.1.
Shown with Tygon 5/16″ fuel tube (yellow) and 3/16″ aquarium “airline” tubing.
I use these to feed air for various low-pressure applications like PCB etching blubbers, laser nozzles, CNC chip clearing, etc.
Threaded fittings need some sort of sealant like Teflon tape if you want them to be 100% air-tight but generally it doesn’t matter since it’s low pressure.
I print them vertically with the largest surface on the build plate.
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NTPCAD001-1.png)
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![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT001.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT002.jpg)
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![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT004.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT005.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT007.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT006.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT008.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT009.jpg)
![](https://gurumeditation.org/wp-content/uploads/sites/6/2023/07/NPT010.jpg)