This part adapts the threads on the exhaust of the Harbor Freight Pittsburgh Vaccum pump to a GERSON P100 respirator filter to reduce or eliminate oil mist. The M24x1.5mm threads will probably fit some other vacuum pumps, if you think it might fit a different vacuum pump I would split the part to just include the threads and some of the cylinder and do a test fit first. P100 filters are rated for oil mist, and this one is sold at HF making it extra convenient. You will also need 2x 212 o-rings to seal on each side.

I used gyroid infill as a pre-filter to improve the lifespan of the P100 filter, so there are modifiers in the model to achieve that. Make sure you open as project, rather than importing geometry, then replace the printer profile with your own. Verify that the the top and bottom of the part have exposed gyroid infill in the preview tab before printing. If you are using a slicer other than Prusaslicer or Orcaslicer, you may need to change some of those settings yourself, but I would pick the closest relative (ie if using Bambu Slicer open the OrcaSlicer file). 

This works great for reducing the oil mist if using a vacuum pump in an enclosed space for degassing epoxy or silicone. When I ran the vacuum pump the first time I noticed a haze in the air from the oil mist, and figured reducing this mist would be good for my health and to avoid coating everything in the room with a very fine layer of oil.