Product review (3 stars): Installation instructions FWD from manufacturer, helpful FYI
The thing came with no instructions. The Insinkerator site helped with this advice:
"If you are using the FDT-00, here is what you need to do to connect the flexible tube to the disposer. Force Two Bolt Flange over the raised lip on the Flexible Discharge tube. Stretch the Rubber Gasket over the raised lip of Flexible Discharge Tube with flat side of Rubber Gasket facing out. Make sure that the raised lip sits inside the groove on the inside of the Rubber Gasket. Secure the Flexible Discharge Tube to the disposers discharge opening (Rubber Gasket in discharge opening) using the Two Bolt Flange. No need to use the Flanged Washer."