External thread structure, which is leak-proof, easy to clean, and stable in pressure. Equipped with a 3-stage carbon fiber filter, it has a total switch for easy daily manual switching without adjusting the flow rate, making it the best choice for beginners. Features: Newly upgraded with a total valve switch, convenient for daily manual switching without adjusting the flow rate. Leak-proof, easy to clean, stable pressure. External thread design, preventing blockage, the sealing ring is inside the thread, preventing the material from running to the thread position. 3-stage carbon fiber filter, effectively filtering impurities. New patented bubble counter, directly inject water with a syringe, the equipment can also add water during normal operation. Highly sensitive safety relief valve, When the air pressure in the bottle exceeds 35kg, the pressure will be released automatically Specifications: Main material: Stainless steel Main color: Silver Voltage: AC 100V-240V input; DC 12V output 3 size optional: 1L: Height: 22.5cm; diameter: 10cm; 2L: Height: 37cm; diameter: 10cm; 5L: Height: 42cm; diameter: 13.3cm; Package List: 1*three-stage filter element 1*syringe 1*water bubble counter 1* spare sealing ring 1*7CM refiner 2*suction cups 1* trachea 1*solenoid valve 1* power cord