the latch more than 90 degrees the dimensions of the structure permit operating the openings from a single hand in use the attach is tremendously reliable and easy to operate the installation is done directly on the tractor incidentally there is no need to drill holes neither in the tow bar nor in the double hand a principal body 50 that can be a simple or a double sleeve comprising a superior face 57 and a lateral face 51 a means to install to the tow bar that can be centering screws an eccentric that would be safe and secure a superior plate 34 disposed on the superior face that could pivot around an axis 44 and comprising means to retain vertically in place the retention component 30 acting in the maintaining in place of the trailer behind the vehicle a pendular latch 36 disposed on the lateral face side pivoting around an axis 58 and comprising a counterweight 38 retained towards the bottom under the action of gravity and comprising an elongated side 82 with an excess 83 preventing the plate from turning while the elongated side is positioned towards the top the device comprises also a stopping plate bar 42 preventing the turning of the plate when passed at an open position restraining the rotation of the plate to a 90 degree angle the device comprises also a latch stopping bar 40 restraining the rotation of the latch to a 90 degree angle the means to install to a vehicle.