2pcs Aquarium CO2 System Tube Valve Guage Bottle Cap Aquarium Bottle Cap Fish Tank Live Plant DIY Air Diffuser Generator Tool

Item type: Carbon dioxide cap Material:ABS Color: as picture Size:Cap opening diameter 3.3cm; height 3.2cm Function: Suitable for all kinds of DIY reactors, directly tightened carbonated beverage bottles, safe, durable, and air-tight. Package include: 2pc