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Saf-T Vent Seal is manufactured entirely of AL 29-4C ® superferritic stainless steel. We won’t compromise performance with conventional alloys anywhere in the system. Laser butt seam welds and advanced resistance-welded fittings leave walls smooth inside, to minimize friction and resistance, and prevent collection of combustion by-products. Saf-T Vent Seal is UL 1738/ULC S636 and is Listed to meet all code requirements for condensing and positive pressure special gas vent systems.