These bottles and carboys have a screw in dispensing spigot that can be replaced with a plug (included) when the vessels are used for long-term storage. Heavy knurling on the cap provides excellent grip for opening and closing. The smooth sides accept adhesive labels and can be marked with most indelible markers. Spigot opens fully in one half-turn Molded of polyethylene, which resists corrosive acids and alkalis Extra heavy walls, yet lighter than glass