Sierra 18-7916 JohnsonEvinrude Oil Filter Sierra canister oil filters are designed to meet or exceed OEM specifications and are built for maximum corrosion resistance. 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 OEs filtration Backed by Sierras industry le