Thing built to adapt a standard Ridgid shop vac fine dust filter to use inline for my shop vac system. I use a cyclone separator as a first step filtration system, then the fine dust filter to keep fine dust from entering my vacuum or leaving the exhaust. For convenience, I used black ABS 2" drain piping to plumb the vacuum lines and they work well.

Both filtration stages use buckets for cost effective build and maintenance. This design should allow you to use any buckets as long as they are large enough to accommodate the filter. I included photos with a tape measure for to help you get an idea of the dimensions needed.

For the build you will need a bucket the right size. I used a bucket from my supermarket bakery that was used for shipping frosting. The bakery will usually give them to you for free and these buckets are much more rigid than buckets bought at the home store.

You will also need about a foot (12in) of threaded rod. I used 1/4 20 rod and Nylon Nut/washers/wingnuts for ease of availability (in the US).

Screw the rod into the center of the middle adapter, secure with a nut and epoxy in place.

Cut a hole in the bucket bottom, lid and drill for the 1/4 20 bolts. Assemble with a sealant of your choice. I used black RTV for this but I have used regular silicone and caulking in the past.

The top coupler outlet is a snug fit with ABS. If you use ABS you can also permanently attach the pipe using ABS cement for a permanent and very durable connection.

The bottom coupler inlet OD is the same size as a 2" abs pipe (~2.44 in), meaning you can use either an ABS coupler or a rubber adapter to connect it to flexible hose as I did.