Dura Vent 4" 90 Degree Round Type B Gas Vent Elbow

Dura Vent 4" 90 Degree Round Type B Gas Vent Elbow 4" 90 Degree Round Type B Gas Vent Elbow, 4 Piece Design. 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. • 90° Elbow is adjustable from 0° to 90° in sizes 3" to 10"