Features: Make from Metal and Plastic materials, which can bear wear and ensure long term use. This electric solenoid Valves is N/C normally closed type. Solenoid valves can maintain constant current flows and are easy to install and maintain. Normally closed miniature solenoid valves, and open when energized, and close when off. It can be used as water valves or air valves and has a wide range of uses. For example, automatic watering control for flowers. Specifications: Material: Metal and Plastic Size: about 14.5x25cm/5.71x9.84inch voltages: 5V Package Includes: 1Pc Electric Solenoid Valves note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.