Installation Kit, 2.5", Round Metal Plenum (5 outlets) Includes (5) Supply Outlets, (5) Metal Take Offs, (5) Winter Supply Shutoff Caps, (10) Scrim Core Clamps(silver), (10) Toggles and Screws, (10) Aluminum Core Clamps (black), (1) Balancing Orifice Kit, (5) Couplings with (10) Tape Rings