Food Grade Materials Support High pressure- The working pressure of the hose is 5000psi. The brass and aluminum construction has excellent performance in terms of resistance, Both the hose and o-rings are made of food-grade materials, ensuring safety and reliability. They not affect the taste of the carbonated water and provide excellent air tightness. Compatibility-The standard external hose can be used in large CO2 storage tanks and fits soda maker machine .Compatible with for DUO/TERRA/ART/Crystal3.0/. (NOTE: 1. Not suitable for Art Terra or DUO pink system 2. Only treats gaseous CO2 and does not process liquid CO2. Liquid CO2 make your drink taste bad.) Save Cost on Soda Clinder Refill- This co2 adapter system allows you to connect your soda maker machine to an external Non-Siphon CO2 canister that has a outlet valve.