Toyota Prius Owner's Manual page 556

5-2. Steps to take in an emergency
STEP 14
With the compressor switch off, disconnect the hose from the
valve on the tire and then pull out the power plug from the
power outlet socket.
Some sealant may leak when the hose is removed.
STEP 15
Install the valve cap onto the valve of the emergency repaired
tire.
STEP 16
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PRIUS_OM_OM47A19E_(EE)
Attach the air release cap to the
end of the hose.
If the air release cap is not
attached, the sealant may leak
and the vehicle may get dirty.