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 or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Air Injection Check Valve: Testing and Inspection

Remove check valve and test for leakage by first blowing air into valve through pump side and then through air manifold side. Air should flow through air pump side only. If air flows through air manifold side, replace valve. Note that a small amount of air flow through the manifold side is acceptable.