Transcrete America Pumps: Slurries to 20mm aggregate mixes, slabs, decks, footings, lightweight, shotcrete, mud jacking, pressure grouting, masonry grout and tiebacks. Used concrete pumps, for example the Transcrete Alpha Hydraulic Pea- Rock pumps operates without vavle-balls given many line concrete pumpers combat the harsher, lower slump, 1/2 inch minus rock mixes, engineers and contractors are now specifying to reduce cracking.