Perfect Replacement Lid for Optima Flasks This spare lid is compatible with Milton Optima Thermosteel flasks and fits 350ml, 420ml, 470ml, and 500ml sizes, making it an ideal replacement for lost or damaged lids without replacing the bottle. Leak-Proof & Secure Fit Precision threading ensures a tight, leak-proof seal, preventing spills while carrying the flask in office bags, backpacks, or travel kits. Safe & Durable Construction Manufactured using BPA-free, food-grade plastic, safe for hot and cold beverages and suitable for everyday use. Easy-Twist Convenience The smooth twist-open mechanism allows hassle-free opening and closing while maintaining the thermal efficiency of vacuum-insulated bottles. ⚠️ Note: Package includes only the spare lid. Bottle not included. Keep your favourite Milton Thermosteel flask properly sealed with this premium replacement lid. Designed specifically for Milton's Optima series, this leak-proof cap is compatible with multiple flask sizes including 350ml, 420ml, 470ml, and 500ml variants. The stainless steel construction ensures durability while the easy-twist mechanism allows for smooth operation. The ribbed grip design provides excellent control when opening or closing the flask. This standard-size replacement lid features a secure seal that helps maintain your beverages' temperature while preventing any accidental spills. Perfect for those who need a replacement for their existing Milton Optima Thermosteel flask or want a spare lid for convenience. The practical design makes it ideal for daily use, whether at home, office, or during travel.

• UNIVERSAL COMPATIBILITY: Perfectly fits Milton Optima Thermosteel flasks of 350ml, 420ml, 470ml, and 500ml capacities with secure threading
• MATERIAL QUALITY: Premium stainless steel construction ensures durability and maintains beverage temperature effectively
• LEAK-PROOF DESIGN: Features an easy-twist mechanism with tight seal to prevent spills and leakage during transport
• EASY MAINTENANCE: Simple to clean and dishwasher-safe design makes regular maintenance hassle-free
• REPLACEMENT SOLUTION: Direct replacement lid that matches original specifications for seamless flask functionality