Sierra 18-1973 marine exhaust riser elbow for MerCruiser marine engines. For 120 HP models and replaces Mercury part numbers 55538 and 39920. Has 2-1/2" outside diameter outlet and 90 degree down-angle. Does not come with gasket or hardware. Mounting bolt center-to-center dims are: 3" x 2-7/16".

About Sierra
Sierra provides premium-quality aftermarket replacements for over 6,000 marine parts, tools, and components. Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty that covers the useful life of the product against any defects in workmanship and materials.

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