... Useful in various kinds of sand blast machines.2. In shipbuilding industry, it can be used ... hose; rubber hose for waterway desilting, cementing pump truck, concrete, grout, sediment, coal injection truck, bulk cement ... shot, sediment, ball bearing, cement powder, cement concrete, dry powder mortar, coal fines, carbon powder, and ... 2,1-3/4,2,2-3/8,2-1/2,3,3-1/2,4,5,6,7,8,10,12,18 ect. Concrete pump ...