... mainly applied to concrete pump pipe connection, product type: DN125 DN100 DN80 NameConcrete pump clamp couplingsSize3.5inch,4inch ,5 inchMaterialHi-Mn ... , Concrete pump piston , delivery cylinder,.ect4: Concrete pump clamp : DN80, DN100,DN125,DN150 Casting pipe clamp and Forged clamp.5, Other ...