uxcell 5 Piece Plastic Fish Tank Air Pump Non Return Check Valves, Clear 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) Material : Plastic; Color : Clear, Red Net Weight : 19g Package Content : 5 Pcs x Aquarium Check Valve