Haobase Aquarium Air Pump Non Return Check Valves, 5 Pieces, Red/Clear

• Air check valve;use for :aquarium, fish tank
• Weight : 15g
• Color : red, clear;material : plastic
• Package contents : 5 × air check valve
• Hole outer diameter : 4.5mm/ 0.177";overall size : 53 x 14.5mm/ 2.1" x 0.57" (l*max. d)

Product Description Protect you air pump by preventing aquarium water from back siphoning during a power outage. Place in your airline tubing between your air pump and aquarium water to prevent water returning down the air line. Box Contains 5 x Air Check Valve