Explore quality B-vent gas vent pipes and fittings at F.W. Webb to find the best parts for commercial or residential applications. Our collection includes essential components for venting in an HVAC/R system, including adapters, termination caps, elbows, increasers, and roof flashing pipes. A flashing pipe protects against leaks in exhaust pipes that vent through the roof. Made in sturdy aluminum, these vent pipes and fittings can withstand normal everyday use. Browse B-vent gas vent pipes and fittings from trusted makers Duravent and Hart & Cooley to find the right fit for an existing unit.