Features: Made of durable stainless steel. Ideal for connecting CO2 additive equipment! Clean plumbing around the aquarium! Specifications: Size (L x W x L): Approx. 8.7 x 0.6 x 2.0 inches (22 x 1.5 x 5 cm); Outer Diameter: 0.2 inches (5 mm); Thickness: 0.04 inch (1 mm); Material: Stainless steel (SUS304BA). Note: This product is for freshwater only. Please do not use it in steamed water or salt water as it will cause rusting. Please wash it with water to remove dirt before use. Please make sure to connect with the tube. If it is difficult to insert it, please heat the tip of the hose with warm water before inserting. There may be small scratches on the folding part due to manufacturing, but it does not affect its performance. Please be aware of Images are for illustrative purposes only. Accessories and parts such as tubes and kissing rubber can be purchased separately.