The KF25 20 Bellow is a corrugated stainless steel pipe that connects to your vacuum flange or hard pipe. These 20 inch malleable pipes allow for some error as apposed to hooking up a hard pipe. Don’t forget other KF25 fittings and accessories:

100% stainless steel. 100% USA made.

Bellow warning:
Stretch and bend your bellow into position before installation. Not doing so will make the bellow shrink, putting stress on or damage glassware voiding limited warranties.