Please Note: This one-way check valve should NOT be used with any type of CO2 system. These one-way check valves are for common aquarium air pumps. Only These check valves are designed to protect your air pump by preventing aquarium water from flowing back during a power outage. Made of durable clear plastic . Net weight: 4g. Air hole diameter: 4mm; Overall Size: 5.3 x 1.5cm (L x Max Diameter). Package Content: 10pcs x Air Check Valve.
