ITEM NAME:Aquarium 1-Way Precise CO2 Needle Valve - Co2 Regulator Adjustment Valves for Description: Precise structure, durable stainless steel inner part with aluminum alloy to release CO2 by fine tuning. Special metal grinded surface, light weight, easy to operate. Ergonomically design, easy to install without using any tool. One way Co2 regulator valve applies nut lock design can effectively lock the CO2 tube, to prevent the accidents caused by loose. Size: Spiral Diameter: 6mm; Length: 4cm Specification: Material: Aluminum Alloy Spiral Diameter: Approx. 6mm/ 0.24inch Length: Approx. 4cm/ 1.57 inch Package Includes: 1 Piece CO2 Adjustment Valve Note: Since the size above is measured by hand, the size of the actual item could be slightly different from the size above. Due to the lighting effects, monitor settings, etc. There could be some slight difference in the color tone of the pictures and the actual item. SKU: ALU0006617864000902.One way Co2 regulator valve applies nut lock design can effectively lock the CO2 tube, to prevent the accidents caused by loose. Precise structure, durable stainless steel inner part with aluminum alloy to release CO2 by fine tuning.