uxcell Aquarium 3 Way Y Type 4mm Hose Tube Airline Air Valve Connector Clear 6pcs Product Name : Aquarium Air Valve;Hose Connector Type : 4mm; Overall Size(Approx) : 38 x 25mm / 1.5" x 1"(L*W);Material : Plastic Simple design for easy use, the Air Valve can be connected to aquarium tubing. 3 Way type Aquarium Air distributor, air valve and air line connector, for 4mm inner diameter soft air tube. Help to increase oxygen and keep air fresh, creating healthy environment for your fish. Can be used as a 1 in 2 out or 2 in 1 out connector.