About this item UNIVERSAL COMPATIBILITY: Perfectly fits Milton Duo DLX Thermosteel bottles PREMIUM CONSTRUCTION: Crafted from high-quality stainless steel with a durable silver finish for long-lasting performance LEAK-PROOF DESIGN: Features a reliable silicone ring seal to prevent spills and maintain beverage freshness SECURE FIT: Engineered with precision threading to ensure a tight, secure closure every time EASY REPLACEMENT: Simple to install replacement lid that maintains the original bottle's functionality and performance