The Blastcrete Model RS180 Mixer-Pump is variable speed from 0-18 cu. yards per hour. The unit is equipped with our robust 12 cu. ft. hydraulic spiral mixer (0-60 RPM) with gearbox drive, 15 cu. ft. receiving hopper with conveyor screw, adjustable 2L8 rotor-stator with the longevity to surpass all competitive equipment, dual axle high speed towing trailer, and all powered with a 55 HP Yanmar water-cooled diesel (Tier 4 Final). The RS180 Mixer-Pump is supplied with our 11.6 cu. ft. skid steer bucket to charge sand and gypsum into the mixer.