Concrete pump delivery pipe General Description of Concrete Pump Pipe with different materials and sizes we supply: A. Welded Concrete Pump Pipe B. ST52 Concrete Pump Pipe C. Hardened Concrete Pump Pipe D.Twin Wall Concrete Pump Pipe Concrete Pump Boom Pipe fitting specifications: 1. Material: ST52, 45Mn2, Q235,20#,37Mn5 etc. 2. Sizes: DN60-DN180 (mm unit) 3. Length: 1m,2m,3m, 6m or according to clients requirements. 4. Packing: With waterproof plastic film and ends