To limit the probability that, in the event of an unwanted release, the escape of liquid will not be minimized, which could lead to the spread of liquid, which could lead to harm to the public.
To limit the probability that the location of the shut-off device will be exposed to fire in the event of a fire near the dispensers, which could lead to delays in reaching and activating the shut-off device, which could lead to the escape of liquid not being minimized, which could lead to harm to the public.