I guess the other thing I'd add is that you should do regular maintenance with these pumps during and off-season, Typically just a very small amount of the specified lubricant added slowly into the vacuum stream while the pump is running. We tend to turn ours only once a month for an hour or so just to exercise them. The tolerances are so tight on these pumps that even a small amount of rust is not a good thing. We also have found that sending them back for cleaning/retuning every 4-5 yrs keeps them running in really good condition.
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