Cabochon Ruby is a non-return valve made from quality Japanese glass and mineral close to ruby. Cabochon Ruby can be used indefinitely, and makes an elegant addition to your aquarium.
Once CO2 supply is stopped, aquarium water often flows backward into the silicon tube toward the regulator. If water enters the regulator, it may cause serious damage.
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.