The Bosch HVAC 87161064330 Flow Turbine Adapter is a replacement component designed for compatible Greenstar boilers. It works with the boiler’s water flow measurement system, supporting accurate detection of water movement through the heating circuit and helping the control system regulate operation. This adapter is used in Bosch Greenstar residential heating equipment to maintain pr... https://www.partshnc.com/bosch-hvac-87161064330-flow-turbine-adapter-select-greenstar-boilers