The 1020 from Adafruit is a twelve inch long food grade heat shrink tube 3/8" diameter.
We decided to stock this food-safe heat shrink specifically for people who were building beer-brewing or sous-vide projects using our waterproof DS18B20+ digital temperature sensors. This heat shrink is FDA Compliant for contact with food. The end of the sensor is stainless steel, but the jacketing is PVC, not good for dunking into your food or drink! But this heat shrink makes it easy - simply slip it on, allowing about 1 cm of the stainless steel sensor cap to be exposed, then heat it up to seal it on. The heat shrink will make a seal over the cap, so that no PVC touches your food project.
Notice for California Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov