2.5 inch shop vac filter insert
Filter insert for a 2.5" shop vac I made to combine with my dust cyclone, uses a Shark Wandvac W1 filter, I'm currently using this as a filter for my robot vacuum mod that replaces the dust bag with a cyclone.
Link to the filter I'm using:
https://www.amazon.com/dp/B09KL1VV8R
There's a Male to Male coupler model included as well if needed.