Features: 100-240V wide voltage input, DC 12V output, compatible with 12V silent solenoid valve. Automatically turns on and off when used with a timer. This CO2 magnetic solenoid valve allows the timer to synchronize with your aquarium lighting system, cutting off CO2 supply based on light cycles, helping maintain healthy aquatic plants, offering convenience and energy savings. Nut locking design for CO2 pipe connection ensures secure fit, prevents disconnection, and provides reliable sealing to prevent leaks. Constructed from aluminum alloy material for durability and stability. Allows user control over outlet timing, easy to install and operate. CO2 Solenoid Valve only; other accessories shown in images are not included. Specification: Material: Aluminum Alloy Size: approx. 4.7 x 5.1 cm (1.85 x 2.01 in) Color: Silver Optional Style: A, B Plug Style: US, EU Quantity: 1 Piece Note: No retail packaging. Please allow 0-1 cm error due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the image may not accurately reflect the actual color of the item. Package Contents: 1 x CO2 Solenoid Valve