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When shopping around for a small-line trailer pump concrete mixer products, you’ll encounter a variety of terms describing the type of piston or valve system used to draw the concrete from the hopper and propel it through the delivery line, such as a ball valve concrete batch mix plant concrete batching plant, rock valve, S-valve, or swing tube. Some of these systems are proprietary to a particular pump while others are more generic. Ask the pump manufacturer to provide details about the performance capabilities and advantages of the system they use.