NOTICE ; - If your lovely breast pump is a problem, First check the below self-diagnosis. - If you need an English manual, please leave an e-mail address and ask for a manual request.1. When milking "one side", the air cap must be closed on the other side.If you milk it while it is open, pressure will not come out.2. The silicon membrane moves well in the backflow prevention device, when the main body operates.When the pressure is poor, the replacement assembly is wrong.Remove all replacement and reassemble step by step.3. Check the silicon head on the funnel.If the silicon head is missing, If it is damaged, there is no pressure.4. When the silicon head is dropped during milkingIf the breast milk component remains in the consumable, the head may slip outClean the inside of the silicon head with the cleaning head to connect the head to the funnel.Please use washing / disinfection5. The replacement time for consumables is 1-3 months. (May vary depending on user environment.) ==== How to Purchase Replacement Silicone Head !#!lt!*! CLICK HERE ==== ---------------------------◆Single-Pumping set◆1 x wide breast shields (28mm)1 x back-flow protectors1 x silicon valves1 x air hose 1x PP bottles1 x Main body1 x Adapter◆Dual-Pumping set◆2 x wide breast shields (28mm)2 x back-flow protectors2 x silicon valves2 x air hose 2x PP bottles1 x Main body1 x Adapter