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Air Check Valve
- Visually inspect thermactor hoses, tubes, control valves and check valves for leaks which may be due to backflow of exhaust gases. If holes are found and/or traces of exhaust gas products are present, replace check valve.
- Check valve should allow free flow of air in direction of arrow only. See Fig 1
. Valves should check or block free flow of exhaust gas air in opposite direction.
- If air does not flow as indicated or if exhaust gas backflows opposite of direction of arrow in illustration, replace check valve.