Selkirk 3EFC-3 1' to 3' Expandable Flexible Gas Vent Connector simplifies connections between gas-fired appliances and rigid type B gas vents. It requires no elbows, expands from 1' to 3', features an integrated draft hood connector, offers 360-degree flexibility, and comes with a limited lifetime warranty. 1-ft To 3-ft 3-inch Compression Inletx3-in Compression Outlet Aluminum Water Heater Connector.