[Complete Size Coverage – 1/2", 3/8", 5/16", Banjo + 3 Yellow Plugs]: Four essential fluid line sizes plus three additional yellow plugs in one comprehensive kit. Covers brake systems, fuel lines, power steering, and AC lines. Always have the right stopper when you need it. [Leak-Proof Double-Layer Design – Zero Fluid Loss]: Precision-engineered interlocking mechanism with soft inner layer conforms to tube ends, creating a positive seal. Prevents fluid escape, keeps work area clean, and eliminates contamination risks. [Non-Damaging Grip – Protects Line Integrity]: Smooth, radiused edges grip without biting into soft metal or hose reinforcement. No scoring, no weak points – just a secure seal that won't compromise future repairs. [Multi-Fluid Compatibility – Brake Fluid to Chemicals]: Effective with brake fluid, fuel, water, gas, and industrial chemicals. One kit handles all your fluid system maintenance needs. [Critical Usage Note]: Verify line diameter matches stopper size before use. Not for permanent installation – remove after service. For brake fluid applications, always wear chemical-resistant gloves., Manufacturer: AURVIX