ideamall One-Way Cock Lever Valve for 4mm Air Tubes, Air Adjustment for Fish Tanks and Aquariums (Pack of 40)

[Adjust the amount of air in your aquarium] This one-way valve (air valve) is a convenient item that connects to an air tube to adjust the amount of air in your aquarium. Simply flip the lever to adjust the air volume to the optimum level for your fish and other creatures, maintaining a comfortable aquarium environment. [Distribute air to suit your layout] One end is threaded, and the other is designed to accept a tube. You can attach PVC pipes or other items to the threaded end to expand the distribution line or create your own DIY serial branch pipe. The number of branches is flexible, allowing you to customize the layout of your aquarium. [Great value for a 40-piece set] While many aquarium supplies are expensive, this product is affordable and allows you to create your own branch pipes, making it ideal for those looking to keep costs down. [Product Contents] One-way valve (air valve) Set Quantity: 40 or 60 pieces Size: 25 x 22mm Outer Diameter: 4mm Inner Diameter: 3mm Compatible Tube Diameter: 4mm Weight: 9g per piece Material: Brass (Surface: Chrome Plated) Color: Silver