Female Flex Adapter 4". by Simpson DuraVent.
PelletVent Pro, offered in 3" and 4" diameters, is designed for use with pellet stoves, low-temperature venting systems, and is also designed to withstand the corrosive flue gasses of corn-burning appliances. PelletVent Pro is rated for continuous flue temperatures up to, but not exceeding, 570 degreeF. PelletVent Pro is not interchangeable with standard PelletVent or CornVent.