Sierra oil filters are highly recommended replacement oil filters for sterndrive and inboard engines. Sierra oil filters, including the Sierra 18-7824-2, are engineered with premium grade materials that will not only withstand but excel in the extreme environment of the marine world. The painted canister features heavy walls and an epoxy coat for added corrosion resistance. All replacement Sierra oil filters are manufactured to meet or exceed OEM specifications and are field tested and approved. Supersedes 18-7824 Sierra 18-7824-2 Oil Filter Features: Anti-drain back valve Epoxy coating on canister for corrosion resistance. Heavy-wall steel canister for further corrosion protection. High-efficiency filter media meets or exceeds the OE&';s filtration. Backed by Sierra&';s industry-leading warranty. Application: For GM marine engines. Used on 4 cyl, 8 cyl, and remote oil filter systems. Short oil filter. Thread Spec: 13/16" x 16NPT.