Round pipe tee connector for supply air ducts. For 110mm ventilation systems. The duct connector is a 3-way 3-hole connector with two branches. With the dryer vent hose, it can be connected to exhaust fans, dryer vent covers and vent connections. When using, please wipe the tee clean, then attach it to the pipe and secure it with aluminum foil tape or install it by loosening the clamp and tightening the screw. Premium Material: The ventilation duct connector is made of high quality ABS plastic, durable, UV resistant, environmentally friendly and non-toxic.