Biasi Magnetic Flow Switch and Filter BI1271501.
City Plumbing
The Biasi flow switch acts as a safety device. It is a switch with an in-built sensor that sits in the pipework for both the heating and domestic hot water systems.
Direct Heating SparesBIASI BI1271501 FLOW SWITCH. Genuine brand new Biasi product, covered by a Biasi manufacturer's guarantee.