Selkirk 1-ft to 3-ft 3-in Compression Inlet x 3-in Compression Outlet Aluminum Water Heater ConnectorSingle wall expandable flexible gas vent connector (Pfc) offers a simple connection between appliance and Selkirk type B vent. No elbows required and expand 1 ft. to 3 ft. UL listed, only requires 1 in. minimum airspace clearance to combustibles and has multiple applications, can be for single vent or combined vent. Expandable flexible gas vent connector Flexible connector is designed to simplify connections between a gas fired appliance and rigid