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 sync with your aquarium's 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 tubing connection ensures secure fit, prevents disconnections, and provides reliable sealing. Leak-proof performance. Constructed from aluminum alloy material for durability and stability. Designed for easy installation and precise control of CO2 output timing. CO2 Solenoid Valve only; other accessories shown in images are not included. Specifications: Material: Aluminum Alloy Size: approx. 4.7 x 5.1 cm (1.85 x 2.01 in) Color: Silver Style Options: A, B Plug Type: US, EU Quantity: 1 Piece Notes: No retail packaging. Please allow 0-1 cm variation due to manual measurement. Ensure you are comfortable with this before purchasing. Due to monitor display differences, the actual item color may vary slightly from the image. Package Contents: 1 x CO2 Solenoid Valve