While the sports water bottle is durable, the silicone spout will wear out over time. Simply replace the spout for a longer lifespan of your bottle. The silicone spout is suitable for b.box sports water bottles in sizes 450 ml and 600 ml. The silicone spout for your thermos bottle does not require any pressure; a light suck is sufficient. The spout for the insulated bottle is dishwasher safe (top rack only).