Strong Seal: The piston rod is made of thick aluminum and has two piston seals. There is no pressure leak. The back cap with the plunger is very easy to remove and seals perfectly when attached. Transparent Body: The transparent bottle body with manual extraction and scale can check the extraction liquid status at any time to better control the amount of extraction. Locking Design: Simply slide the tube into the end of the pump and it will lock automatically. So you don't have to worry about it falling or blowing out when you use the pump to prime it. Easy to Remove: Remove the white plastic collar in which the pipe is inserted. It is spring loaded and it will move something, when it does, the hose can be pulled out easily. Widely Used: This product has chemical resistance and oil resistance. It can be used to replace automotive fluids in cars, trucks, recreational vehicles, etc., and can easily remove brake fluids, antifreeze, gear oils and other fluids.