This is a small/medium replacement lid for ION8 leak-proof green water bottles. It features the same one-touch, one-handed operation, smooth flow, and leak-proof design with a safety lock as the original lid. The replacement lids are complete units, including new fitted closure seals. Designed for ION8 small leak-proof bottles, this lid offers one-touch open, fast flow, and a leak-proof seal with a safety lock. It includes a spout, vent, and closure seals, and is compatible with RECYCLON and STEEL models. This small size fits bottles from 320ml to 600ml, helping you save money by extending your bottle's life with a simple lid swap.