These are OEM Subaru expansion tank coolant lines for the 2015-2021 WRX STI.
45162Q: Runs from the coolant expansion tank to the metal pipe that runs along the back of radiator to the coolant overflow.
45162W: Runs from the radiator to the coolant expansion tank.
45174: Hard line behind the radiator.
See the diagram for a visual look at where these go.
Each line includes two clamps.
Fits all 2015-2021 Subaru WRX STI.
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