Sierra 18-0549 Plug Off Cap 1 I.D. Sierra high quality engine parts are designed to meet OEM specifications. For V8 Stern Drives and Inboards 1977 - present. Interchangeable with GLM 22290 JohnsonEvinrude Outboard 909829 3852476 Mallory 9-42720 OMC Inboard 909829 3852476 OMC Stern Drive 909829 3852476 Volvo Penta 3852476 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Engine Parts Product MPN 18-0549 Product UPC 030999874535 Fast S