If a pump is going to sit for more than a few months fill the oil case with oil (overfill and submerge the module) and pour oil in the intake to act as an oxygen barrier. As long as it has been stored in a climate controlled area there is no concern unless the pump has sat for more than a couple years. In that case, add a small amount of oil into the inlet (about an ounce or so) and jog the motor on and off a couple times to pre-lube the internal surfaces prior to startup.
Category: Pumps
Sub-Category: Oil-Sealed Mechanical Vacuum Pumps
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