Full Flow Dry Joint Gasket | Quicksilver 27-864547A02 Quicksilver full flow gasket used on engines with risers and installed. Quicksilver full flow dry joint exhaust gasket For Mercruiser dry joint exhaust applications with two open holes Used on engines with separate exhaust risers and elbows Installed between exhaust riser and exhaust elbow - see attachment Replaces Mallory 9-61430, Sierra 18-0721 and Barr Marine MC-47-27-864547