A doser including one or more cartridges for holding one or more products. The cartridge has a body defining a cavity for holding the products, a nozzle disposed on the body and connected to the cavity for dispensing the product from the cavity, and a piston arranged to move within the cavity to propel the product from the cavity into the nozzle. The cartridge also has a cap removably coupled to the cartridge for protecting the nozzle. Lastly, the doser has a dispenser for holding the cartridge or cartridges which actuates the piston, and removes the cap from the cartridge, so that the product is dispensed from the cartridge.
