Dura-Vent 3PVP-24B 24 Straight Length Pipe - Black Listed To UL 441. Marketed Exclusively To The Specialty Hearth Market. Laser-Welded (Not Spot Or Pop Welded) 304 Stainless Steel. Perfect Fit Construction Allows Ease Of Twist-Lock Connections While Eliminating Leaks - No Gaskets Or Package Quantity: 1