Twin Disc Drive Ring Marine Transmission Damper Coupling Ring - Used

Used Twin Disc-style marine transmission drive ring (damper coupling ring) — the internal-tooth ring that bolts to the engine flywheel and drives the splined damper plate on the input of a Twin Disc MG-series marine gear (MG-506 / MG-509 / MG-514 family). Cast aluminum outer flange with hardened steel internal tooth ring, 8-bolt outer flange pattern. Approximately 12–13 in OD. Application: Twin Disc MG-5xx series marine transmission flywheel-to-damper drive ring. Condition: Used take-off in good serviceable condition — light surface oxidation on the teeth, no visible cracks or chipped teeth in the photos, marked OK from prior inspection. Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.