While not particularly common, Cutthroat Flumes can be provided with inlet / outlet end adapters and pipe stubs.

Here a 18-Inch x 4-Inch Cutthroat Flume is outfitted with end adapters and 6-inch stubs. The flume, in conjuction with some hydraulic changes, solved a long standing problem the trailer park had that other manufacturers were unable to solve. Go us!