Yanmar Saildrive Dip Stick O-ring for SD50 and SD40 Yanmar Saildrives.
This part is the dipstick O-ring that should be changed when changing the oil on a Saildrive model listed below.
It is also the drain plug o-ring for SD40 and SD50 Saildrives.
For Yanmar Saildrives:
SD40, SD50
Yanmar Part Number: 189010-01130
