Plastic One-Way Check Valve for Aquarium Air Pump, 10pc Pack

This plastic one-way check valve is designed for aquarium air pumps, fish tanks, and CO2 systems. The package contains 10 pieces.Key Features Material: Plastic Port size: 4 mm Inner diameter: 4 mm Application: Aquarium air pumps, backflow prevention Package: 10 pcs Usage Connect the valve to tubing from your air pump or CO2 system. Install with the correct orientation to allow one-way flow. Replace if you notice cracks or leaks. Care and maintenanceRinse with clean water if needed. Do not use wi