90131-896-650 Drain (12x15) Bolt - Overview. The 90131-896-650 Drain (12x15) Bolt is a genuine Honda OEM component essential for maintaining the integrity of drainage systems within Honda marine engine systems. This drain bolt plays a crucial role in securely sealing the oil drain points to prevent leaks and maintain proper fluid containment, thus ensuring the engine operates efficiently and reliably. Precision-made to meet Honda's strict factory specifications, it ensures seamless integration w