8" DuraVent DuraTech Galvalume Tee Support 8DT-TSB This tee support is used as wall support for chimney system. Use of straps is optional. Supports up to 50' of DuraTech Chimney without straps and 70' of DuraTech Chimney with straps. Attaches to chimney pipe. Can be installed above or below the tee. If installed below the tee a short section of pipe is required. Adjustable base provides 2" to 6" clearance to wall. Approved for most fuel types 430-alloy stainless steel inner wall 2" clearance to combustibles ThermalTech blanket insulation eliminates hot spots Twist-lock connections for strong secure fits Able to vent large fireplaces and building heating appliances Clean smooth exterior finish 10â€-24†diameter pipes feature an .027†430 stainless steel inner wall and an outer wall of .029†galvalume or .027†430 stainless steel. A Refractory insulation is encased between walls. Only stainless pipes use the stainless end rings. Regular galvalume pipe uses galvalume end rings.