Product details:

The Elbow Strap is to prevent excessive weight on the elbows by supporting the weight of the chimney. An elbow strap is required to be installed between two elbows in offset installations. Multiple elbow straps may be required for offset installations. DuraTech is a 1" wall, all-fuel chimney system for use with wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas. See all 16" DuraTech Chimney Components .