Sierra 18-7915-1 Oil Filter for JohnsonEvinrude, Suzuki Outboards Sierra high-quality oil filters are designed to meet OEM specifications. Installing Sierra oil filters is easy, built to be a direct replacement. Thread Spec 34 x 16 NPT Anti-Drain-Back Valve Engineered with premium grade materials that will excel in the extreme marine environment Epoxy coated for corrosion resistance Heavy-wall steel canister for further corrosion protection High-efficiency filter media that meets or exceeds the