... stainless steel,copper,bronzeShaft:carbon steel 45#,stainless steelMechnical seal:graphite/silicon carbide/tungsten carbide O-ring:EPDM/ ... mix and water are not interaction.4, double-end face mechanical seal, long-term in the oil chamber,ensure pump safe ... dynamic seals, both auxiliary sealing function,to protect the mechanical seal. And also balance the axial force, extending bearing service ...