Marketing InformationDuraFlex® Pro is the ultimate in flexible steel liners for strength and flexibility. It features 20% more stainless steel per foot compared to other liners on the market. Its extreme flexibility facilitates problem-free installations where multiple offsets are needed. DuraFlex® Pro is available in 3 in through 12 in Dia lengths, kits and custom lengths. DuraFlex® Pro is manufactured utilizing highly corrosion-resistant 316 stainless steel. Listed to UL 1777 and ULC S635.