Sierra 18-7977-1 MerCruiser Fuel FilterSierra replacement fuel filters are manufactured to meet or exceed OEM requirements.Features: Micron rating: 20; Includes 0-Rings; Supersedes: 18-7977 ; It is recommended to change this filter and your 18-7715 Pre Fuel Filter at the same time for optimal engine performance.Fits: 2004 & Newer MCM/MIE engine with Gen III fuel cooler; Interchangeable with: Mallory; 9-37827; MerCruiser Stern Drive; 35-866171A01; 35-8M0093688;