I purchased a Dust Stopper bucket mounted cyclone and the 2.5" hose was too heavy and kept making the bucket tip over so I wanted a more stable solution. I also didn't want to take up more valuable shop space so I opted to stack the bucket on my shop vac. These pieces are the lower cup mount and upper flange mount to adapt 1.25" pvc pipe to fit the sockets where the 2.5" vacuum tubes mounted on the rolling base. The upper flanges are sized for 2x3 or 2x4 lumber or a sheet of plywood with 4 countersunk holes for #8 screws. I also included a 2.5" to 1.25" nozzle adapter. I use this with my miter saw and palm sanders.
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