This is an OEM AC Delco vapor canister/purge valve for the LUJ/LUV 1.4T, which is located at the rear of the engine. It is recommended to replace when diagnosing P0171 conditions along with various other PCV system failures on the 1.4T. 

Fits: 2012-2020 Chevrolet Sonic, 2011-2016.5 Chevrolet Cruze, 2013-2021 Buick Encore, and 2015-2021 Chevrolet Trax. Does not fit 1.8 engine or new LE2 direct injected 1.4T.