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ST52 seamless delivery tube 1m, 2m and 3m for concrete pump truck with pipe wall thickness: 4.0/4.0/5.0/6.0/7.0/8.0mm I. MAIN FEATURES Material: 20# & 16Mn Wall Thickness: 4.0/4.0/5.0/6.0/7.0/8.0mm ...