1Application: Outboard water pump impeller is suitable for Omc King Cobra sterndrives, and suitable for 3.2L 32DAPEAMH, 5.7L 574APEAMH, etc. 2Part Number: Replacing OEM numbers for reference are 987176 3854072, and other OE, replacement for Sierra 18?30585. 3Multiple Use: Neoprene impeller is used for sea water pumping such as engine cooling, water delivery, wash down and bilge pumping and other purposes, for fresh or sea water work. 4Recommendation: You should replace your flexible pump impeller at least once a year or earlier, depending on engine duties. Always carry a spare impeller with you before boating sports. 5High Performance: Flexible 12?blade impellers undergo a rigorous quality process to ensure reliable, efficient and durable performance.