"Cabochon Ruby", a glass back-flow prevention valve, which was discontinued about two years ago, will be back at the new price. It will be available for shipment from Thursday, September 1.
You can make your aquarium more stylish by adding a Cabochon Ruby to the CO₂ supply system. Please enjoy Nature Aquarium with an aquarium system designed entirely by ADA.

■Cabochon Ruby – Product Information
https://www.adana.co.jp/en/contents/products/na_co2/detail02.html#series-box1