... concrete pump pipe connection, product type: DN125 DN100 DN80 NameConcrete pump clamp couplingsSize3.5inch,4inch ... fittings : Wear plate and wear ring, S valves, Concrete pump piston , delivery cylinder,.ect4: Concrete pump clamp : DN80, DN100,DN125,DN150 Casting pipe clamp ... and Forged clamp.5, Other accessories: Rubber ...