Warm Tips: When installing the manual siphon pump, please kindly make sure the following steps are correct:1. The container which you want to get rid of fluid is in up HIGHER position than the target container you are flowing into.2. Both of the original container and the target container are not in a sealed state.3. Exhaust the gas in the tube hose before using siphon pump.4. When you put fitting end into the container, must keep it inside of the container, NOT just on the surface.5. Both of the PVC hoses are not knotted or twisted together.6. The rubber ball is in the right way, the indicator arrow which on the rubber ball, should toward to the target container that the fluid is flowing into. It means that the side which the indicator arrow shows, is the outlet.7. Check the two hoses are in correct installation, the longer one is installed on the input side of the rubber ball, the shorter one is for the outlet side.Please Note: 1.If the siphon pump hoses have kinks, please try to soak the kink part into a small amount of hot water for 1-3 minutes to restore it, then will not affect the use of function.2. Not suitable for drink water, salt water and any chemical liquids. 3. If the product you received has any quality problem ( man-made damage not included), or if any questions and not satisfied with our product , please feel free to contact us firstly by email, we will help you out promptly and positively.