T ConnectorsT connectors can split your breathing circuit to run a second pneumatic stone from the same pump. You can also combine two inlets to create a more powerful outlet for use with multi-outlet pumps. High QualityThe air flow control valve is made of quality plastic material, which is durable and easy to use. A small piece of non-toxic plastic that allows you to connect two air circuits. air or more.Gas volume adjustment turn Simply rotate 90 degrees from fully closed to fully open. aquarium is convenient to adjust the gas volume of the air pump.Valve control handleWith the valve control handle, it is convenient to regulate the air flow from bottom to bottom. top.Handy tool for keeping fishThis dice control valve aquarium air bit is a good product for keeping fish.