Yes and please note the following: We use a natural rubber bulb with our dropper assembly; a material used for such purposes for over 100 years. Iodine is a disinfectant,highly corrosive and drying agent/halogen. If subjected to extreme temperatures, certain levels of humidity or dryness or not stored upright this corrosion and drying may occur and affect the rubber bulb. Most times it never happens. Nonetheless, J.CROW'S guarantees customer satisfaction and guarantees every bottle sold for the life of the bottle. We will replace any dropper assembly or dropper bulb at any time at no charge. With over 50 years of manufacturing experience, we have determined that a glass pipette dispensing assembly is far superior for accurate measurement than any other method available. Orifice reducer tops are not satisfactory since there is no control for dispensing accurately. Bottles with two tops mean you have to interchange and iodine gets all over the place. Any bulb and pipette assembly dispensing a halogen are potentially subject to corrosion, drying or evaporation through membrane leakage. We are aware of all these variables and stand by our product, the dispensing system, and its efficacy, in every instance.