Suitable for sealing the silicone ring of the brewing head of Delong coffee machine 9335/9665/EC685/680/SMEG Operating Steps 1. Prepare tools for disassembly. 2. Turn the machine over to expose the sealing diagram of the boiling head components. 3. Use a cross wrench to remove the screws from the cooking head filter screen. 4. Use a screwdriver to pry out the boiling head and pass it through the bay net. 5. Cover the sealing ring with a stick and pull it out a bit before pulling it out by hand. 6. Finally, install the new sealing gasket back, cover the cooking head filter screen back, and then tighten the screws to complete the replacement. The sealing ring is made of rubber material, which is relatively fragile. Please try not to disassemble it repeatedly as repeated disassembly may cause damage to the sealing ring. Our store only sells accessories and is not responsible for any damage to the machine or accessories caused by the buyer's disassembly process. The sealing ring can only have a leak proof effect if the components of the flushing and boiling head are not damaged. If the sealing ring is replaced correctly and water leakage still occurs, it may be due to the flushing and boiling head components or other problems. Our store does not conduct fault diagnosis. Buyers are requested to identify the problem themselves or contact after-sales service for resolution. The 3 sealing ring is a disposable accessory and there is no follow-up maintenance service. Please be cautious when taking photos. The sealing ring is a consumable item and cannot indicate its service life. It is generally recommended to replace it every 3 months to ensure the sealing performance of the coffee machine.