SELKIRK CORP 206018 6x18 Stainless Steel Pipe/Lock Band Manufactured in United States Easy to use Highly durable Sure-Temp, 6" x 18", 6T-18, All Fuel, Double Wall, Chimney Pipe Comes equipped with locking band and solid pack insulation Tested to withstand 2100 F and is UL listed Test helps to prevent product damage, or structural hazard during brief periods of this excessive chimney temperature Constructed with a stainless steel outer casing and inner liner. 2" inch minimal clearance to combustibles