The Rheem RTG20281-1 Horizontal Vent-Cone Termination Kit is specifically designed for 2 in. x 4 in. wall installations, providing an efficient solution for venting gas appliances. This kit features a cone design that enhances airflow and minimizes back pressure, ensuring optimal performance. Made from durable materials, it is resistant to corrosion and high temperatures, making it suitable for long-term use. The kit is compliant with industry standards, ensuring safety and reliability in your venting system. Ideal for use with Rheem tankless water heaters, it simplifies installation while maximizing efficiency.