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Feature

The check valves are for common aquarium air pumps. Please DO NOT use them with CO2 system. Great one way check valve for aquarium and fish tank.
Protect you air pump by preventing aquarium water from back siphoning during a power outage.
Made of durable clear plastic. Net weight: 0.14 oz / 4 g. Please use a paperclip to poke it from Input side to Output side when the outlet inside gets stuck.
Air Hole Diameter: 0.15" / 4mm; Overall Size: 2.1" x 0.58" / 5.3 x 1.5 cm (L*Max.D)
Package Content: 6 Pcs x Air Check Valve

Description

The check valves are for common aquarium air pumps. Please DO NOT use them with CO2 system.

Place in your airline tubing between your air pump and aquarium water to prevent water returning down the airline.
Be attention:
Please DO NOT use them with CO2 system.

Made of durable clear plastic. Package Weight: 0.89 oz / 25 g