Cherne® Air-Loc® Manhole Testers provide the most efficient, accurate and cost-effective method of testing new, existing, and rehabilitated manholes. Vacuum testing identifies infiltration and exfiltration problems by creating a vacuum in a manhole then monitoring a gauge for vacuum loss.
Vacuum Manhole Testing

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FAQs
How much vacuum (inches of mercury) do manholes need to be tested to?
10 inches
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