This flexible tubing is great to use because it has less memory than rigid tubing and is less likely to spring back or pop out of the pot or reservoir. The material used is Food Grade quality. All sizes refer to the Internal Diameter (ID) of the tube.

Note, as this is flexible tubing, it will help form a good seal. The 13mm (used in a Multiflow V1 system), and the 19mm (used in a Multiflow V2 system) are black & 25mm tubes are a green.