The 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. When the pump is activated, the flow switches senses this movement and feeds the information back.
Comes with O-rings
Technical specification
Waist Sizeaa88cb13guTypeFlow SwitchERP RatingNot ApplicableSupplier Part Number39820820Brand NameFerroli