ACDelco 1 Terminal Knock (Detonation) Sensor - 213-3522 Part #: 213-3522 Line: ACD ACDelco 1 Terminal Knock (Detonation) Sensor 1 Year Limited Warranty Thread Size: M13 Terminal Type: Pin Connector Shape: Round Terminal Gender: Male Attachment Method: Screw-On Number Of Terminals: 1 Show More Show Less