The Bosch HVAC 8716119295 Diaphragm Valve is an OEM replacement component designed for compatible Bosch Greenstar, Greenstar ErP, and CDi series boilers. Installed within the boiler’s gas assembly, the diaphragm responds to pressure changes to help regulate gas flow and support proper combustion. This component contributes to stable heating operation, efficient fuel use, and reliable ... https://www.partshnc.com/bosch-hvac-8716119295-diaphragm-valve