It is a durable and decorative glass made check valve. The valve is produced from a mineral close to Ruby, and it does not deteriorate from a long-term use. Moisten the mineral before installation.
CO2 Bubble Counter
It is a bubble counter for measuring the amount of CO2 supply. According to each aquarium condition, it can supply adequate amount of CO2 even for beginners. Its simple yet functional design well matches Pollen Glass.
CO2 Beetle Counter
It is a CO2 bubble counter for large size aquariums. It has a practical and playful design, and the bubbles can be easily counted as CO2 rises in a spiral. It is designed to be used with Pollen Glass Large or Pollen Glass Beetle.