Sierra 118-0550 Exhaust Manifold Plug Off Cap 1-1/4 Inch

The Sierra 118-0550 is a rubber cap designed to cap off exhaust manifold nipples on marine engines. This essential cooling system component features a 1-1/4 inch inside diameter and is engineered specifically for OMC V-8 stern drives and inboard engines.

Key Features:

• 1-1/4 inch (31.8mm) inside diameter for secure fit
• Durable rubber construction for marine environment
• Designed for exhaust manifold applications
• Meets OEM specifications for quality and performance

Application:

For V-8 model OMC stern drives and inboards from 1977 to present. Fits OMC replacement manifold part #OMC-1-912441, OMC-1-912442. Also used on Crusader early style thermostat housing.

OEM Cross-References:

• OMC 909830, 764799
• Mercury 878991
• Mallory 9-42721