Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 235Get this manual
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1998 MODEL 200225
Exhaust Plate Gasket Adaptor Relief Valve Screw (M8x25) Carrier Grommet Poppet Spring Gasket Relief Valve Plate Assembly Diaphragm Washer Screw (1 0-16x34 in Gasket Cover Screw