One comment

  1. Avatar ddeltoro15 says:

    Great Video! We use the two hose direct vacuum method as well. However most times we have found that after getting to about 250 microns we isolate the pump and the microns rise above 500 after 15 minutes of standing sometimes over 1000! Does this indicate a leak somewhere? The nitrogen test holds and does not drop so the microns rising throws us off. What could it be?

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