This 60 to 90 reducer attachment for parking heaters is suitable for adapting hot air pipes of varying diameters. The plastic deceleration buffer valve helps to regulate airflow, reducing turbulence and noise. It is easy to install, making it a convenient solution for maintaining optimal heating efficiency in cars, RVs, and other mobile environments. Features -Color:Black -Material:Plastic -Size:9.70X9.70X5.80cm/3.81X3.81X2.28in -Diameter of both ends: 60mm, 90mm -Flexible installation: the adapter's design allows for easy transition between different duct sizes, facilitating quick and easy installation - material: constructed from robust plastic, this adapter is designed to endure prolonged use and resist wear and tear -Enhanced airflow: it can minimizes air resistance, promoting efficient airflow and optimal heating performance -Equipment protection: the buffering function of the plastic material helps to safeguard the heating system and ducting from potential damage - application: this adapter is compatible with a wide range of vehicles, making it a versatile accessory for various heating duct installations Package list: 1 x heating adapter