The Velocity is the latest design of replacement cartridge from Falcon Waterfree for Armitage Shanks Aridian and Falcon waterless urinal bowls.
The manufacturer says that the Velocity cartridge lasts longer than the previous model due to faster flow through the internal trap and less splashing within the trap cavity, resulting in slower build-up. It is also easier to identify when the cartridge needs replacing because the blue sealant fluid will cover an "indicator" when the cartridge is full.