double threaded brass fittings provide vibrations resistant sealing across temperature, meeting strict automotive standards for brake line connection precise engineered 4.76mm diameter enables seamlessly compatibility with standard, reverse, and double flares brake lines without requiring tube expansion Ideal for mechanics and enthusiasts maintaining small car, SUVs, or trucks using 3 / 16in or 3 / 8in brake tubing systems Perfect for brake systems repairs or upgrades where reliability, easy installation meets OEM grade in harsh driving conditions High strength brass construction ensures durability, resistance, and heat tolerance in this 4.76mm flareless brake line connectors for secure automotive fluid transfer, Manufacturer: Rxgiasup