The Genuine BMW Manual Transmission Drain/Fill Plug - 23117531356 is a component used in BMW vehicles with manual transmissions. This plug is responsible for draining and filling the transmission fluid, which is essential for proper functioning of the transmission. It is a genuine BMW part, meaning it is made by the original manufacturer and meets all quality and compatibility standards. This plug is designed specifically for manual transmissions and may not be suitable for use in automatic transmissions. It is an important part for maintaining the health of the transmission and should be regularly checked and replaced if necessary.