This DOT approved rubber flexible brake line hose is perfect for your hydraulic trailer brake system. Measuring 17 inches long, you would commonly use this brake hose on boat trailers, but you can absolutely use it on any trailer that has hydraulic brakes. Rated for high pressure, this brake line can be used for drum or disc brakes using either a surge coupler or electric over hydraulic units. One great advantage of this rubber brake hose is that it is UV rated to help keep it from rotting or deteriorating in the sun or salt water. The ends are brass 3/16” male inverted flare fittings that fit into most trailer calipers, wheel cylinders, master cylinders or solenoid valves that use 3/8-24 thread pitch. The end fittings also swivel which keeps the brake hose from getting twisted while you're tightening up the fittings.