... 18 months. pump, vacuum pump, vacuum equipmentFJ-620/FJ-500F Molecular Pump UnitFJ-620/FJ-500F series combined molecular pump unit is a ... or FF-160/500F combined molecular pumps, fore-pump, cutoff vent valve, backing line, water shutoff protector, ... elements and vacuum technique etc.Molecular pump unit--FJ-620/FJ-500F molecular pump unit technical characteristics:Product typeFJ-620FJ-620TFJ- ...