The Rain Cap is a vertical vent accessory designed to protect tankless water heater’s exhaust systems from rain, debris, and other outdoor elements. It is essential for maintaining proper airflow and preventing moisture intrusion in vertical venting setups. Built from durable Category III stainless steel and part of the N-Vent system, this firestop integrates seamlessly with other components using a quick-snap connection, eliminating the need for tools or sealants.