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Features: Practical to use: These aquarium check valves are one-way, small in size so that it is compact for you to carry around, protecting air pump by preventing aquarium water from back siphoning during a power outage, very practical to use in the daily life. Warm tips: When disassemble the non-return check valve, please pinch the vent with your hands gently, because sometimes the rubber is slightly stuck due to high temperature or other reasons. Specifications: Material: plastic Color: as pictures show Size: as shown in the pictures Package includes: 30 x Aquarium air pump check valves Note: Due to the different monitor and light effect, the actual color may be a little different from the picture's. Since the size above is measured by hand, the size of the actual item you received could be slight different from the size above.