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)

Or, hide this message: temporarily or permanently

Check Valve, Checking

Check Valve, Checking

• The check valve - A - must allow air through in the - direction of the arrow -.

• The check valve must remain closed for the opposite direction.

Observe the correct installed position!