Features:

• Gas Vent Pipe Increaser
• Type Double Wall, Round
• Applicable Standard UL 441, CUL, NFPA 54/211
• Larger End Size 8" Diameter
• Smaller End Size 4" Diameter
• Material Thickness 0.012" Inner Wall, 0.018" Outer Wall
• Material Aluminum Alloy Inner Wall, G90 Galvanized Steel Outer Wall
• Used On Gas Vent
• Height 8.5"
• Warranty 1 Year Limited