Honda FCX Emergency Response Manual page 19

Emergency Procedures
Red Locking Cover
Manual Hydrogen Shut-Off Valve
(Turn 1/4 turn clockwise to stop the
flow of hydrogen.)
Continued
3. Remove the red locking cover, then flip
the switch from ON to OFF.
4. Reattach the locking cover to prevent
the switch from inadvertently being
flipped on.
5. Locate the red handle of the manual
hydrogen shut-off valve (it's in front of
the tire in the right rear fenderwell).
6. Turn the handle one-quarter turn
clockwise to stop the flow of hydrogen.
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