The Preheat Cap is meant to simplify the preheat process as an accessory for any standard brew head Flair model (see below).
The silicone Preheat Cap will fit snugly onto the bottom of your standard brew head (only compatible with NEO Flex, NEO, Classic and Signature models, not compatible with PRO2 or Flair 58). Just add onto the bottom when you’d like to preheat your cylinder, add boiling water, and wait at least 30-45 seconds before dumping.
Then, dump the preheat water through the top of your cylinder and remove the preheat cap by using the custom thumb tab that will keep you far away from any hot water. Brew as desired!