I bought this to fit a small Oneida cyclone to my Ridgid shop vacuum. It's advertised as a 2 1/2 inch jack, but I couldn't connect to any of the various Ridgid compatibles I had. I expected it not to connect directly to Oneida's ports - and it doesn't. to other supposed 2 1/2" fittings or tubing I bought from Woodcraft who (I think) also sell Powertec fittings. It also doesn't fit standard PVC plumbing. It was missing anything from 1/8th 'to 1/4'". After all, I didn't use the ones I bought. Maybe one day I'll find something that fits, or I'll adjust it using some methods you can find online (think: lots of tape or make a jig to shrink one end) Tight sizing errors (I couldn't find any) can with larger ones Clamps can be fixed if your vacuum hoses are flexible enough.
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