SAE 90 Hypoid Gear Oil GL 5 Mineral Oil 4Boats Speedometer Pitot 75 kn (includes pitot & hose) 4Boats Quicksilver Premium Plus 2 Stroke TC W3 Outboard Oil 10 L 4Boats PVC Pull Pull Out Scupper Drain Valve 4Boats Solarika Tyldesley ULTERRA 80 US2 i Pilot BT 60 marine drive unit 4Boats. Magnesium sacrificial anode CM762144M from Duff, designed to protect Mercury outboards and MerCruiser sterndrives from electrochemical corrosion in freshwater environments. Part number: CM762144M Material: Magnesium (for freshwater use) Fits: Mercury outboards & MerCruiser sterndrives and engines Hole: Recessed, unthreaded 13 mm (0. 51 in) diameter Function: Sacrificial anode to protect hull, outdrive and internal metalwork Fitment: Direct replacement, OEM style shape Installation: No threading required for the recessed hole Magnesium anodes are intended for freshwater use; use aluminum or zinc anodes for salt or brackish water.