The DuraTech 7 Class A Chimney Pipe Elbow Strap is used to prevent excessive weight on the elbows by supporting the weight of the chimney. Required to be installed between two elbows in offset installations. Multiple elbow straps may be is required for offset installations.ADA Compliant: No Collection: DuraTech Fuel Type: Coal, Gas, Oil, Wood Height: 16 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 7 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Double Wall Weight: 1 Width: 9