Update your heating and cooling with quality components, like the DuraVent 7DP-AWS DuraPlus Adjustable Wall Strap, 7" (9169). At PlumbersStock, we carry trusted brands and reliable parts. Use in interior or exterior installations to support and to stabilize the chimney while assuring a 2” clearance. Wall straps are required every 4' on exterior of building. Adjusts 2”-6” from wall.