The Navien Tankless Water Heaters 20011438A O-Ring EPDM P14 is a durable sealing component designed for use in Navien tankless water heating equipment. Made from EPDM rubber, this O-ring creates a secure seal between connected components, helping prevent water leaks and maintain proper system performance. It is commonly used during maintenance or repair of compatible tankless water he... https://www.partshnc.com/navien-20011438a-o-ring-epdm-p14