Dura Vent 4" X 18" Round Type B Gas Vent
Dura Vent 4" X 18" Round Type B Gas Vent 4" X 18" Round Type B Gas Vent, OD 4-5/8" Dura-Vent gas vent pipe and accessories assemble quickly with twistlock connections. Type B Gas Vents are for venting listed natural gas or liquid propane Category I appliances.
