Welcome to the store! If you only have one pump, but there are several small fish that need encouragement, how do you choose the pipe T-piece? It can be used to lead into two groups for different pump devices, increased supply capacity or other purposes. Separable cylinder oxygen pump, for valve and pipe supporting the use of oxygen, good effect. Usage: The T-piece outlet ends of the inlet end, a direct oxygen tube can make a gas flow become two parts. The connection for connecting between pipes (hose) for air flow, oxygen, oxygen pump, water Diameter: Outer = ?5 mm. (used with pipe diameter Inner = ?3 mm) Specifications: Color: Transparent Material: Acrylic Quantity: 10 pcs Note: 1. Please allow 0-1 cm error due to manual measurement. Please make sure you do not mind before you bid. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 10 pcs Plastic Control Valves Your satisfaction is our highest priority. We will provide you with the best service. If you find any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!