PM Concrete Pump Spare Parts-Boom Pipe Material:ST52, 45Mn2, 20#,Q235 Brand: Schwing, PM, Sany, Kyokuto ... 2" Concrete Pump Straight Pipe 1.Profile and Products: We are a professional manufacturer of concrete pump parts in China, specialized in ... producing concrete pump delivery pipe, rubber hose, elbow, bend, reducer, coupling ...