sorry my post was a bit of a mix up to much red me thinks
i have made an extraction pipe under the bench then ran a single 1 1/2 " pipe from the 4" pipe to a band saw then split that with another 1 1/2" pipe to the top(blade) on the same run i have a drill which i also want to extract from pipe has end stop not sure how to go further.
it's a small bench top 8" delta the base has a 1 1/2" outlet, would i be better to blank that of and try to fix 4" under table with the end of the pipe reduced to create a slot ,do you think would be any use.
the drill is also a bench top any advice for extraction?