Dura Vent 4" Oval to Round Adapter for Oval Type B Gas Vent

Dura Vent 4" Oval to Round Adapter for Oval Type B Gas Vent 4" Oval to Round Adapter for Oval Type B Gas Ventfor Oval Type B Gas Vent, Dura-Vent gas vent pipe and accessories assemble quickly with push together connections. Type B Gas Vents are for venting listed natural gas or liquid propane Category I appliances.