I currently have 4" ducting in the shop (I did it before I knew better). I'm looking to add on and move up. I think I'll be building my own blast gates and would also like to use quick connect fittings for the hose to ducting connections like I have now. I don't have room to move the DC from machine to machine. I also have to be able to move the machines around.

I found these a while back

http://woodworker.com/cgi-bin/FULLPRES.exe?PARTNUM=146-351&LARGEVIEW=ON

but opted for a less expensive local solution that has done me well for the 4" stuff. Neither option comes in 5 or 6 inch.

What I'm interested in knowing is if anyone has any ideas on how to make the Fazlok type connectors from PVC? I figure some type of jig would be needed to get the slots exactly 180 degrees apart. Any ideas?