AIR BYPASS VALVES Protects against water ingestion Crafted from mineral-reinforced nylon — never corrodes Eliminates the unlikely chance of water ingestion should the filter element become wet from deep puddles, rain, hail, sleet, snow or any other scenario in which the filter element could encounter or become submerged in water. The valve installs along the upper portion of the inlet pipe on the same axis as the throttle body centerline. Should a drop in pressure occur within the pipe, the valve shuts down induction at the filter and routes incoming air through the valve's external orifices, eliminating any chance of water ingestion. Available in three sizes to fit every AEM intake diameter. Manufactured and assembled in the USA.