Direct replacement 4-pin mono amplifier jack. Includes lock nut and washer. Fits Princeton Chorus, Pro 185, BXR Series, Stage 112SE, Ultimate Chorus, Roc Pro Series, Performer Series, Bronco, '94 Twin, Princeton 112+, Deluxe 112+, Automatic GT, and Blues Junior amplifiers. • MFSKU 0990912000 • UPC 717669505707