Indmar 1.5:1 ratio marine transmission.

Oil Pump (71C-60).

Indmar 872020-1 is the part number for a genuine 1-quart bottle of Indmar Automatic Transmission Fluid (ATF).

Please let me know if you need any further specs or part numbers stamped on the casing.

Unit does not appear to be failed. The remaining oil appears clean without any debris.

Indmar Marine Engines has been a leading manufacturer of inboard gasoline engines for performance boats for decades, particularly known for their engines used in ski, wakeboard, and wakesurf boats. The "MODEL 082120ES" likely refers to a specific transmission model designed to pair with their engines. The "ES" could potentially stand for "Electronic Shift" or "Electronic Spark," depending on the exact component it refers to. The "RATIO 1.5:1" is the gear reduction ratio, meaning that for every 1.5 revolutions of the input shaft from the engine, the propeller shaft turns once. This ratio is crucial for matching the engine's power to the propeller to achieve optimal performance and speed for the boat it's installed in. The "SERIAL NO. 9818" is a unique identifier for that specific unit.