The PelletVent Pro Female Flex Adapter is used to connect stainless steel flex, for relining a masonry chimney, to the male end of a PelletVent Pro pipe. PelletVent Pro is a venting system designed for stoves and inserts that use wood pellets and oil fuel. It is also built to vent corn and other biofuel products (Rated for continuous use flue temperatures up to 570? F).