This is an oil drain cap for lawn equipment. It is sometimes called a pipe cap. It sits at the bottom or side of the oil pan and helps to ensure that the oil in the motor does not leak out. If the oil drain cap is stripped or not functioning properly, it could mean the engine will start to leak oil, which will hamper the performance or cause additional damage.This component may start to corrode with extended use, or the threads could become damaged. The oil drain cap is relatively simple to replace. A wrench will be needed to replace this part. Wait until the engine is cool and then disconnect the spark plug wires before starting work.This oil drain cap is intended for use with lawn equipment from Tecumseh, Toro, MTD, Husqvarna, and Craftsman. The piece is sold individually, and it is a genuine OEM replacement part.