Peerless ACC557 3" Truss Ceiling AdapterOverview Specifications Truss Ceiling Adapter, adapts the Jumbo or Jumbo 2000 Ceiling Mount to square, round, rectangular or I beam type trusses [up to 3" (76mm) in diameter]. Adapter can be used with or without an extension column. Attaches to a round square, rectangular ,or I Beam truss up to 3" wide x 3 1 2" high Unit has 1 1 2" 11. 5 NPT fitting for attachment of extension column Product Downloads Download Product Sell Sheet Download Product