VAYINATO Aquarium CO2 Bottle Generator Quick Twist Cap A & B with Air Tube & Check Valve Aquarium Tool

vAYINATO 2 Pack Aquarium DIY CO2 Generator Bottle Cap, Carbon Dioxide Reactor, for Fish Tank, Aquarium Plants System Accessories Specification Material: Made of high quality plastic, very durable and can last a long life. Size: Approx. 3.3x3cm(1.30x1.18inch);. Features Can be directly screwed to the carbonated beverage bottle to use,no air leakage, very durable and airtight. Application Easy to install, and suitable for all kinds of DIY reactors. Function Can add or control the amount of CO2 which is available to your fish and plants, add essential CO2 into your aquarium water. Package include 2 Pack Aquarium DIY CO2 Generator Bottle Cap in total. 2 Pcs Bottle Cap With 2 Meter Co2 Tube and 2 Pcs Check Valve,