AEMs patented Air Bypass Valve virtually eliminates the chance of hydro-lock in the event you submerge the filter of your AEM Cold Air induction system in water. On most systems, the valve installs along the upper portion of the inlet pipe and shuts down induction at the filter when it becomes submerged, rerouting air through its external diaphram to keep water out and air flowing in.

Compatible with Cold Air Intake (CAI) system. NOT compatible with V2 intake system.