Sierra 18-0550 OMC Exhaust Manifold Plug Off Cap 1.25 I.D. Sierra high-quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. I.D. 1-14 Interchangeable with GLM 22280 JohnsonEvinrude Outboard 909830 3852476 Mallory 9-42721 OMC Inboard 909830 3852476 OMC Stern Drive 909830 3852476 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Engine Parts Product MPN 18-0550 Product UPC 03099