Large one way check valve for aquarium air pump
Small and compact / Made of durable plastic
Compatible with Aquarium Air Tube Standard of 4mm Inner Diameter These are large check valves for aquarium air pump.
Protect it from aquarium water pump by preventing back siphon during a power outage.
Package Includes: 4 x one way valve
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BleuMoo 4Pcs Plastic One Way Non Return Check Valve Aquarium Co2 System Aquarium Air Pump - B0797RHBJF