... Gas Hole Ratio≤0.01%Leading manufacturer for concrete pump spare parts, fitting to Putzmeister, Schwing, Kyokuto, Sany, Zoomlion ... parts3. other concrete pump spare parts: delivery Pipe(both normal and hardened) , elbow(welding& casting), reducer, rubber seal, ... pistons,coupling, intermiate ring, swing lever etc Concrete pump spare parts manufacturer