CO2-Proof Tubing (Black) CO2-Proof Tubing - Normal airline tubing can lose up to 20% of CO2 through its membrane. Silicone tubing reacts w/ CO2 and render it less efficient (thus the silicone hardening over time under CO2 usage)....
Special high viscosity liquid to prevent evaporation and spillage in Bubble Counter. To be used externally only and comes in 50 mL spout cap for easy & direct application. Imported from Germany.