Yanmar fuel and oil system copper washer.
Part Number 23414-120000 is used on the pipe connections to the engine-mounted fuel filter strainer on all Yanmar YM and GM-based engines.
This copper gasket is also used in many other applications including the lower lubrication pipework on a 1GM10 and 1GM. To help identify this copper washer, it is 18mm wide and about 1mm thick.
Yanmar Part Number: 23414-120000
Fits: All GM and YM series Yanmar diesel engines.