Answer
The Koine 4 parts book (mixing chamber drawing 2) lists two sets: a D.8-1.5 DX ECO stator and rotor (1107030 and 1107031) and a D.6-3 DX stator and rotor. Each carries a serial-number note in the book, and those note ranges overlap, so do not guess: check your machine code and send us the model and serial number, and we will confirm which set applies. The same green D8-1.5 stator and rotor (1107030 and 1107031) are also the listed set in the Small 50 parts book, and IMER's product sheet says the Koine 3.1 includes an adjustable D8-1.5 rotor and stator.
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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.