DescriptionThe heater duct pipe is made of aluminum foil material, durable and practical to use. Anti-shock, corrosion, flame resistant. Besides, the included warm air vent outlet suitable for 42mm warm air ducting, please confirm it is right for you before purchase.Features-Color:Black. -Material:Aluminum foil, plastic. -Size: About80.00X4.20X4.20cm/31.44X1.65X1.65in. -Pipe inner diameter: 42mm/1.65in. -Tube before stretching: 32cm/12.59in. -Tube after stretching: 80cm/31.49in. -Vent Size: 77mm/3.03inx6 2mm/2.44in. -Outer vent diameter: 42mm/1.65in. - Perfect to replacement the old or broken heater duct pipe and air vent outlet, convenient for you to use. -Suitable for 4 hole diesel air heater, paving air heater, car, truck, boat, and more. -Exquisite workmanship, fine texture, simple installation method and durable quality. -Non-deformation, impact resistance and aging resistance for long-lasting reliability. -A wide of application. Mainly used for air heaters, hot and cold, air ducting for heater, etc.