The Bivo Dusty The Dirt Cap is a functional and durable accessory designed to safeguard the spout of your water bottle from dirt, dust, and other contaminants. With its precise design and practical features, it provides reliable protection while maintaining the cleanliness and hygiene of your drinking water. FEATURES : Keeps mud, dirt and grime out of your nozzle Simple, compatible design LFGB compliant food-grade silicone Does not affect nozzle function Can be operated with one hand Works with all Bivo Gravity Flow lids