Quick Connect screwless system Perfectly round, perfect fit pipe to pipe with smooth-weld and precision end-forming technology 1" clearance to combustibles Listed to UL2112 and ULC/ORD-C441 for gas-fired direct vent and pellet appliances and ANSI Z21.EE standards Manufactured in the USA Lifetime Warranty Compatible with Ventis Direct Vent Pellet products, our smooth- weld technology means virtually invisible seams and precision end forming for a better fit. Powder coating avaliable.