Adapter for filling gearcase lubricant on most 8mm metric Honda, Nissan, Tohatsu, Yamaha, Mercury & Evinrude applications Metric Gear Lube Fill Adapter | 551-334M Metric Gear Lube Fill Adapter 8mm tip fits most Honda, Nissan, Tohatsu, Yamaha, some Mercury & some Evinrudes Does not fit Suzuki 8mm x 3/8-16 Replaces 91-883704Q03, 91-883704K03, 551-33M