4DFA-25 | Gas Vent Pipe | Aluminum | 4 in X 25 ft | Duravent570437798SKU:4DFA-25Inventory ID:03605020Select Item:Price: $245.85Quantity: 4 in X 25 ft Aluminum Flex Gas Vent Pipe Use with Category I gas-burning appliances with draft hood. UL1777 aluminum liner. Reviews Choose your rating12345