TubeANew makes replacement tops and reusable plastic cartridges that help people get more use from clogged, damaged, or empty caulk tubes. Its patent-pending replacement top fits standard caulk tubes made from plastic, cardboard, or metal, while its refillable HDPE cartridges are designed for DIY repairs and custom mixtures. The products are intended to reduce wasted caulk, repeat hardware-store trips, and discarded tubes.