Dura Vent 3" x 4" Round Type B Gas Increaser
Dura Vent 3" x 4" Round Type B Gas Increaser 3" x 4" Round Type B Gas Increaser, 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.
