Dura Vent 4" Round Adjustable Type B Gas Vent Roof Flashing

Dura Vent 4" Round Adjustable Type B Gas Vent Roof Flashing 4" Round Adjustable Type B Gas Roof Flashing, 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.