Manufacturer Name: NAVIEN TANKLESS WATER HEATERS Product Number: 30011586B OEM Part Number: 30011586B The Navien Tankless Water Heaters 30011586B Gas Valve Sit 848 Sigma is high performance gas valve that is used in HVAC systems for accurate control. This valve has a long-lasting and strong working ability due to the material used which is aluminum alloy. https://www.partshnc.com/30011586b-navien-tankless-water-heaters-gas-valve-sit-848-sigma