Peerless Dct 300 Truss Ceiling Decoupler (Discontinued by Manufacturer) Unit has Peerless-AV ADD extension column fitting for attachment of an ADD extension column; Width 0.000; Depth 0.000; Weight 0.00; Color; Operating System; Batteries Included; Batteries Required; Number of Batteries; Battery Type; Language English; Assembly Required Not compatible with 1-1/2 -11.5 NPT extension columns or pipes Includes integral high density rubber decoupler assembly to prevent vibrations Attaches to round, square, rectangle, or I-beam trusses up to 3" wide x 3-1/2" high Height 0.000