4LifetimeLines Brass Brake Line Union – 3/16" (4.75 mm) M10 x 1.0 Inverted Flare Connector for Hard Lines (Steel, CuNiFer, PVF, Stainless)

Get leak-free, road-ready brake repairs with this 3/16" (4.75 mm) M10×1.0 inverted-flare brake line union. Machined from corrosion-resistant brass, it’s built to stand up to winter road salt and daily use while maintaining a secure hydraulic seal. Perfect for joining two hard lines in maintenance or replacement work, it’s compatible with steel, copper-nickel (CuNiFer), copper-coated steel, PVF-coated steel, and stainless brake lines—exactly what pros keep on hand for quick, lasting fixes. Backed by 4LifetimeLines’ lifetime support.

• Correct spec for common repairs – Fits 3/16" (4.75 mm) lines with M10×1.0 inverted-flare threads used on many domestic & import vehicles.
• Durable, salt-resistant brass – Brass body resists corrosion better than plain steel, ideal for rust-belt climates and winter driving.
• Hydraulic-brake ready – Purpose-built union delivers a tight, leak-resistant seal for joining hard brake lines during service.
• Multi-material compatibility – Works with steel, CuNiFer, copper-coated steel, PVF-coated steel, and stainless replacement lines.
• Confidence built-in – Supported by 4LifetimeLines lifetime warranty for shop and DIY use.