I honestly don't know. I didn't take it apart. Just tightened it.Do they have copper washers sandwiching the connector.??
Is the dealer the only option for that oring?Every Takeuchi here gets that leak...my TL150s on the drive pump outputs and TB180FR & TB53FR machines on the main pump outputs.
Since it is a BSPP port, it is important that one not use a SAE/ BOSS/ STOR Oring. There is a difference.
Tightening w/o replacing the O-ring will result in fitting loosening within a shorter period of time.