Answer
Per IMER's product sheet, all three are towable barrel mixers with a Honda GX160, 5.5 hp gas engine, steel box frame, torsion bar suspension, forklift pockets and a quiet sealed gearbox. The Workman II 250 (gas model 1105850) gives a 6 cu ft batch; the Workman II 350 (gas model 1105855) gives a 9.5 cu ft batch. The 350ED is the end-dump version of the 350, so you can load and dump without unhitching from the tow vehicle. The 250 and 350 are also offered with a 1.5 hp electric motor in 120 V or 240 V.
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Reviewed by our parts specialists from IMER manuals and parts books. Check the part number on your machine or in its parts book before you order. Not sure? Ask a parts specialist.