[Widely Used] Suitable for all types of aquariums, such as fish tanks, heavy-duty professional water pumps, commercial air pumps, etc. [Easy to Use] The air distributor connects to the pump hose to manually control the flow of important air valves or to turn the pump on or off. Compatible with 4mm air outlets or tubes. This aquarium air flow distributor is made of high-quality stainless steel, smooth, durable, and long service life. [Gas Diverter] The aeration pump accessory, Oxygen, allows you to divert gas. It can convert 8mm air flow to 4mm.