US Patent 7628338 Refill for a volatile material

A refill for a volatile material includes a container having a reservoir portion and a neck portion. The refill further includes a plug assembly disposed within the neck portion of the container and a channel through a central portion of the plug assembly. Still further, the refill includes a porous wick extending through the channel, wherein the wick includes an upper portion extending outside the container and a lower portion disposed within the reservoir portion. A slit is formed in the lower portion of the wick to form a barb that catches on the plug assembly to prevent removal of the wick from the container.