5pcs Plastic One Way Check Valves for Aquarium Air Pumps

This set includes 5 plastic one way check valves designed for aquarium air pumps. These valves prevent water from flowing back and damaging the pump or other equipment.

• Material: Plastic
• Valve style: Plug structure
• Color: Blue
• Overall length: 36 mm (1.42 in)
• Middle circle diameter: 8 mm (0.31 in)
• Ends diameter: Inner 3 mm (0.12 in), Outer 4 mm (0.16 in)
• Fits common air pipes with approx. 4 mm inner diameter
• Air outlet side clearly marked; opposite side is air inlet
• Each valve allows pump placement above or below water surface to avoid backflow when pump is off