Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
If it fails: lemon-manuals.org.ua

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Vacuum Check Valve: Testing and Inspection






Apply 54 kPa (16 in. Hg.) vacuum to "check" side of valve and trap. If vacuum remains above 50.6 kPa (15 in. Hg.) for 10 seconds, the valve is acceptable.