How-To and Tutorials
A Simple DIY Airbrush Regulator for Better Control and Cleaner Paint
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A Simple DIY Airbrush Regulator for Better Control and Cleaner Paint
Sometimes the best solutions are the ones you make yourself.
In this post, I’m sharing a look at my custom-built airbrush pressure regulator setup—complete with a moisture filter and quick-connect fittings. It’s a low-cost solution using parts from Harbor Freight (though you can find similar parts online or at any hardware store), and it’s been a game-changer in my painting workflow.
I use two types of airbrushes—gravity fed and siphon—and switching between them used to be a hassle. This setup makes it quick and easy with standard fittings and a clear view of my pressure level right next to where I work.
The key components:
- A regulator and filter combo
- Quick disconnects for the input and output
- A short pipe extension for flexibility
- Threaded bushings to adapt the output to standard 1/4” fittings
If you’re in a humid environment like I am, having a moisture trap is essential. I live near the coast where humidity can easily hit 90% in summer—without the filter, you’d see water splatter in the line. No thanks.
Another nice touch? Being able to tweak the pressure on the fly without having to walk over to the compressor. When you’re mid-session and trying to dial in just the right paint flow, that kind of convenience is huge.
Here’s the general flow:
- Compressor plugs into the input side.
- Regulator sets the pressure.
- Output side connects to your airbrush line with a quick connect.
- Done.
I also recommend wrapping the threaded parts with Teflon tape to prevent air leaks and using the included mounting bracket to keep things solid on your workbench.
I’ve included links to parts I used (no affiliate stuff, just what worked for me). Of course, feel free to tweak this design to fit your needs. That’s the spirit of this hobby—figuring things out and making them better.
Parts Used:
- MERLIN 3/8 in. NPT(F) Air Filter with Regulator – https://www.harborfreight.com/38-in-nptf-air-filter-with-regulator-58178.html
- If you just the Regulator without Filter – MERLIN 1/4 in. NPT(F) Mini Regulator – https://www.harborfreight.com/14-in-nptf-mini-regulator-58183.html
- Output – MERLIN 1/4 in. Male Industrial, Automotive, and ARO Style Universal Coupler : https://www.harborfreight.com/14-in-male-industrial-automotive-and-aro-style-universal-coupler-63550.html
- Input – CENTRAL PNEUMATIC PROFESSIONAL 3/8 in. x 5 Ft. Swivel Whip Air Hose – https://www.harborfreight.com/3-8-eighth-inch-x-5-ft-swivel-whip-hose-98943.html
- Other Quick Connectors : MERLIN 1/4 in. Brass Industrial Coupler Connector Set, 5-Piece – https://www.harborfreight.com/14-in-brass-industrial-coupler-connector-set-5-piece-63557.html
Thanks for checking it out, and if you’re interested in more airbrush tips or model painting tools, be sure to subscribe to the YouTube channel and sign up for my newsletter.
Next week, I’ll be sharing how I built a simple turntable for painting—stay tuned!
Until next time—thanks for being here.