30cc fluid pump for transferring automotive fluids. It's a gear oil pump, differential fluid pump and transmission fluid pump. Connects to gallon bottles with 38mm, 40mm, 42mm and 50mm. Will also fit wide-mouth quart bottles with 38mm opening. Includes 3 different length suction tubes for bottles of various heights. 3rd hand adapter is connected to end of clear fill tube that helps to secure tube in fill hole.