Specifications
Type: Air Valve
Outlet Diameter: 4mm
Inlet Diameter: 4mm
Fits Standard: 3/16″ diameter tubing

Features:
These aquarium oxygenation gas supply system accessories work seamlessly with air pump air pipes
Allow fine-tuning of gas flow
Adjustable size makes it suitable for general control of air pump output and other applications requiring size adjustment
Crafted with exquisite workmanship for accurate control

Package Included:
10 x Air Valves