To answer a few questions i see you guys have, you can place just about any type on construction material up too 4" in diameter. Rock, ABC, backfill, slurry, concrete up too about a 7" slump depending on the mix. For concrete applications a collapsable hopper assembles with 6 cotter pins in just a few minutes and also controls the volume of mud going up the feeder belt. For Aggregate we have 1 yard and 5yard hoppers
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