Flexible aluminum used for lining chimneys to vent gas burning appliances. View Details46DVA-CL33 | Co-Linear Termination Kit | High Wind Termination Cap | Duravent00115041 CompareCompare SelectedAs low as: $583.20 View Details46DVA-CL33H | Linear Termination Kit | High Wind Termination Cap | Duravent00115042 CompareCompare SelectedAs low as: $482.65 View Details46DVA-CL33P | Co-Linear Termination Kit | Prairie Style Termination Cap | Black | Duravent00115043 CompareCompare SelectedAs low as: $643.53 View Details4DFA-25K | Flexible Gas Kit | Aluminum | 4 in X 25 ft | Duravent03605013 CompareCompare SelectedAs low as: $335.50 View Details4DFA-25 | Gas Vent Pipe | Aluminum | 4 in X 25 ft | Duravent03605020 CompareCompare SelectedAs low as: $245.85 View Details6DFA-25 | Aluminum Gas Vent Pipe | 6 inch X 25 ft | Duravent03605027 CompareCompare SelectedAs low as: $358.56 View DetailsSUPMILL-PAC BLK | High Temp Sealant | 1050 Deg.COP16486 CompareCompare SelectedAs low as: $24.00 View Details3DFA-FC | Aluminum Flex Coupler | 3 in |DuraventCOP68800 CompareCompare SelectedAs low as: $22.69 View Details3DFA-25 | Aluminum Gas Vent Pipe | 3 inch X 25 ft | DuraventCOP68803 CompareCompare SelectedAs low as: $194.64 View Details3DFA-35 | Aluminum Gas Vent Pipe | 3 inch X 35 ft | DuraventCOP68805 CompareCompare SelectedAs low as: $245.85 View Details4DFA-FC | Flex Coupler | Aluminum | 4 in| DuraventCOP68825 CompareCompare SelectedAs low as: $24.31 View Details4DFA-35 | Gas Vent Pipe | Aluminum | 4 inch X 35 ft | DuraventCOP68830 CompareCompare SelectedAs low as: $345.77 View Details4DFA-35K | Flex Kit | Aluminum | 4 inch X 35 ft | DuraventCOP69008 CompareCompare SelectedAs low as: $409.80 13