Mercury - Quicksilver Gear Lube Monitor Reservoir Cap For MerCruiser Alpha & Bravo Drives 8067271. Overview. A tight seal keeps your gear lube clean, contained, and your drive protected. The Mercury Marine 8067271 Quicksilver Gear Lube Monitor Reservoir Cap replaces worn or cracked caps on MerCruiser Alpha and Bravo sterndrives, ensuring your lube reservoir stays sealed and functioning as it should. It's a simple but essential part - helping you maintain proper fluid pressure and preventing cont