As clients' requirements.
Stator: NBR, EPDM, FPM/Viton etc.
Rotor: carbon steel, 304/316/904 stinless steel, ceramic, stainless iron, duplex stainless steel etc.
Fixed in screw pump head of cement mortar plastering machine or screw type grout pump.
It is the main vulnerable parts of plastering machine, and should be checked and replaced regularly.