Reverse Delay Valve

Reverse delay valve provides approximately 100 seconds delay before allowing trap door to completely close.

1. Remove vacuum hose from end of valve that is not black in color and apply an external vacuum of approximately 2-4 in. Hg.
2. Using a stop watch, note time required for atmospheric pressure to pass through valve and eliminate vacuum.
3. Replace valve if time required is less than 4.5 seconds or more than 13.2 seconds. Install replacement reverse delay valve with Black end toward trap door vacuum delay motor.