Exhaust pipe reducer solves smoke pipe connection issues, such as mismatched diameters between pipe and wall hole or heater flue. Stainless steel material offers good pressure and heat resistance, resists outdoor , and is durable for connecting appliances to chimney liners or flue systems. Reducer joint fits both large-to-small and small-to-large configurations, with big head inner diameter and small head outer diameter sizing. Standard interface size allows connection with stainless steel and aluminum pipes, suitable for various flue and chimney setups. Stainless steel increaser/reducer for chimney lining connections., Manufacturer: WUSHADEHANS