... Parts-Boom Pipe Material:ST52, 45Mn2, 20#,Q235 Brand: Schwing, PM, Sany, Kyokuto DN125 5 1/2" Concrete Pump Straight Pipe ... , elbow, bend, reducer, coupling, cleaning ball, piston, cylinder, eye-glass plate, cutting ring, concrete placing boom, and so on2. application: We ... -6inch F/MOthers8.010006inch HD/ZX-6inch F/MOthersproduct picture: PM Concrete Pump Spare Parts-Boom Pipe