Abstract: The present disclosure discusses a sterilization system having a dosing module with a dosing cylinder to allow for metered flow of a predetermined amount of sterilant fluid into the sterilization system. The dosing module can include a dosing cylinder for measuring the predetermined amount of sterilant fluid, a pump for moving the sterilant fluid, and a controller configured to initiate driving of the sterilant fluid through the dosing module and into the sterilization system. A method of providing a predetermined amount of sterilant fluid to the sterilization system can include controlling the flow of sterilant fluid into the dosing cylinder, measuring the amount of sterilant fluid in the dosing cylinder to a desired dose amount, and controlling flow of the dose into the sterilization system.