uxcell 5 Piece Plastic Fish Tank Air Pump Non Return Check Valves, Clear

Description

To prevent air pump from damage of suddenly stop caused water back flow in aquarium, when air pump placed lower than aquarium water surface. ; . Product Name : Aquarium Check Valve; Use for : Fish Tank, Aquarium Air Hole Diameter : 6mm 0.2″; Overall Size : 5.3 x 1.4cm 2.1″ x 0.55″ (L*Maximum Diameter)