The Spectre Vacuum Sensor Adapter Kit allows you to add fittings for Vacuum lines or sensors on an air intake system. This kit comes with a 12, 14 and 17 millimeter fitting as well as three grommets for installation. If a hole is needed to insert these fittings, then use in conjunction with the Spectre Hole Saw Kit, part number 9715. Product Features:Contains 12, 14 and 17 millimeter fittingsIncludes three matching grommetsAdds a fitting for vacuum lines or sensorsCan be used with Spectre Hole Saw Kit, part number 9715