2Pcs Aquarium Co2 System Tube Valve Guage Bottle Cap Fish Tank Live Plant Air Diffuser Generator Tool

Describe: 100 new and high quality Material:ABS Color: as picture Size:Inner diameter 3MM, outer diameter 4MM Function: Suitable for all kinds of DIY reactors, directly screwed carbonated beverage bottles, mineral water bottles, safe, durable and airtight. Package include: 2pc Guage Bottle Cap The details are , the design is convenient and the workmanship is good The merchant warrants that their products comply with all applicable laws, and are offered only if they comply with Joom's policies and EU Product Safety and Compliance laws.