An oil drain plug is a part designed to facilitate a convenient and controlled method for draining the oil from an engine and is commonly positioned at the lower part of the machine, threaded into the oil sump or pan, offering an easier point for oil removal. This plug is designed for use within various types of small engine equipment and...Read more requires a hex socket wrench to remove and install. This plug is an OEM part that is sold as an individual and prevents any oil from leaking from the oil sump/pan and need only be removed for oil changes. If you notice an oil leak or poorer performance from your equipment, it may be due to an oil leak caused by a broken or loose plug. To replace this plug, ensure you use the torque setting set by the manufacturer of your equipment to properly secure it.