Works only with collapsible cubes with blue spigot cap and NOT collapsible flat bags. Complete refund if not compatible with your collapsible cubes. Our own custom-designed spigot has superior water flow and durability compared to other manufacturers original. Extra-strength BPA-free plastic to be long lasting, wider opening for faster flow, precise engineered seal to prevent leaks. Fits collapsible cubes from 1 to 5 gallons.