Metal Flange, Snap Flange, Slide on Flange 1 - Rectangular Duct and Fittings 2 - Duct Connection: Flange, Corner, G-clamp Metal Flange, Snap Flange, Slide on Flange Metal Flange/Snap Flange Octopus Metal Co ... and fittings: Elbow, Transitions, Branches, Reducers etc. -----TDC duct connection: flange, Corner, G-clamp -----TDF duct connection: corner, cleat -----Other: Duct ...