The item consists of a cap, MS90376-20Y, with a polarizing keyway. The Electronic Test Interface (ETI) is an optional accessory and may or may not be present on the device, depending on the sub-assembly dash number. For sub-assembly -104, a cover plate, 10104552-101, replaces the ETI. Additionally, this item includes Sensor Surveyor Assembly 10078752-101, Sensor Surveyor Assembly 10078752-102, Plate Identification 435100, and Cap Dust MS90376-20Y.