Dear Sir/Madam, We are working on a new Sand Filter Design and we a need a Backwash control system as follows: Product Name: Backwash Flow Control Valve (Manual) Drain: 3/4 F Inlet size: 3/4 F Outlet size: 3/4 F Inner Core Pole Size: 3/4 Base: 4 Water Production Max: 1 M3/H Tank suitable:6~10 Working Pressure:0.15~0.6MPA Regards, Eng: Amro ElGeneidy Show More