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Air Injection Check Valve: Testing and Inspection

1. Check valve should be inspected whenever the hose is disconnected from the valve or check valve failure is suspected. Any indication of exhaust gases in the air pump indicates check valve failure.
2. Orally blow through the check valve (toward air manifold) then attempt to suck back. Flow should be toward air manifold only.
3. When replacing a check valve, be careful not to bend or twist the air manifold.