Toyota 2012 Prius Owner's Manual page 597

5-2. Steps to take in an emergency
Emergency repair method
STEP 1
Take out the repair kit from the plastic bag.
STEP 2
STEP 3
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PRIUS PHV_OM_OM47818U_(U)
Remove the valve cap from the
valve of the punctured tire.
Remove the air release cap from
the hose.
You will use the air release cap
again. Therefore keep it in a
safe place.