Inta 28mm Flow Balancing Valve With Fill & Flush 5-40 Litre INFBV28Inta 28mm Flow Balancing Valve With Fill & Flush 5 40 Litre INFBV28. Regulates the flow of fluid through the system Maximises heat collection in cylinders Bi directional ball valve stops water flow and allows access to fill and flush connection for servicing 28mm compression connections according to EN1254 2 G 3 4 Fill & Flush connections with retained sealing cover caps Clear window allows for easy adjustment of the flow rate Suitable for use with