Mercury - Quicksilver Sterndrive Exhaust Y-Pipe Seal Exhaust System Component Marine Rubber 41802. Overview. If your MerCruiser has started to sound a little louder than usual or you've noticed water creeping where it shouldn't, this small piece might be the reason. The Mercury Marine 41802 Quicksilver Exhaust Y-Pipe Seal keeps things tight between the Y-pipe and the transom assembly on MerCruiser R, MR, Alpha, and Bravo drives. It's made from a durable marine-grade rubber that holds up to exhau