The ZF Auto Trans Oil Pump O-Ring - 0734313161 is a small circular rubber ring designed to fit around the oil pump in an automobile's transmission. This o-ring helps to create a tight seal between the oil pump and the transmission, preventing any leaks or loss of oil pressure. It is made by ZF, a reputable manufacturer of automotive parts, and has the part number 0734313161. This o-ring is an essential component in ensuring the proper functioning of an automatic transmission, and should be replaced if any damage or wear is detected.