Yamaha Motors
https://www.crowleymarine.com/yamaha/products/69j-43843-00-00-screw-valve-lock
.SCREW, VALVE LOCK 69J-43843-00-00
https://www.crowleymarine.com/yamaha/products/69j-43843-00-00-screw-valve-lock
Price not available
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Product Description
Yamaha factory part.