... amount, rotation: 5-30r/min, stepless variable speedVacuum systemDiffusion pump KT-600, Roots pump ZJ-300, mechanical pump 2X-70, rotary ... pump 2X-8, 304 stainless steel pipingDiffusion pump KT-800 , Roots pump ZJ-600, mechanical pump 2X-70, rotary ... pump 2X-8, 304 stainless steel pipingDiffusion pump KT-800, Roots pump ZJ-600, mechanical pump 2X-70,rotary ...