Delivery devices 100 for controlled discharge of a volatile fluid 118 at a relatively constant rate over a sustained period of time. Volatile fluid 118 may be dispensed in liquid or vapor phase. Rate of fluid discharge from a storage container 103 is controlled by a restriction element 124. Fluid 118 may be urged toward discharge by gravity, wicking, capillary activity, diffusion, pressure internal to the container, evaporation, and/or other fluid transmission through the restriction element 124.
