The Gates emission control hose for 2013–2017 Cadillac ATS 4‑cyl 2.5L connects the valve cover to the air cleaner as part of the emissions plumbing. Intended to replace the factory valve-cover-to-air-cleaner hose, it preserves the vehicle's OEM routing between the PCV/valve-cover area and the intake system to maintain the designed emissions control connection.

Gates 13-17 Cadillac ATS 4-Cyl. 2.5L Valve Cover To Air Cleaner Emission Control Hose