H&C 6RN7 6" TO 7" INCREASER

[ "Sheet Metal Gas Vent Increaser", "Type Double Wall, Round", "Larger End Size 7 Inch", "Smaller End Size 6 Inch", "Length 5-1/4 Inch", "Material Thickness 0.012 Inch (Inner Wall), 0.018 Inch (Outer Wall)", "Material Aluminum (Inner Wall), G90 Galvanized Steel (Outer Wall)", "Applicable Standard UL", "Used On Type B Gas Vent" ]