Yamaha Lower Unit Assembly - 6H3-45300-19-8D 303 Products - UV Protection Material: Built from marine-grade composite

Material: Built from marine-grade composite materials with sealed internals for corrosion protection

CZone and NMEA 2000 compatible communication

Housings are cast from corrosion-resistant aluminum and machined using Sierra's own specially-engineered tooling

6T5-45111-00-EK - CASING

Yamaha Lower Unit Assembly - 6H3-45300-19-8D 303 Products - UV Protection Material: Built from marine-grade compositeYamaha Lower Unit Assembly Outboard Drivetrain 6H3 45300 19 8D Overview A worn lower unit is something you feel every time you shift or throttle upit just doesnt run right. Ive swapped units like this where the motor went from noisy and inconsistent to smooth and dependable again. Its the kind of upgrade that brings confidence back when youre running out or coming into tight spots. When everything below the powerhead is solid, the whole boat feels