Line safety couplings with button, with scratchproof and shockproof rotating body. They comply to ISO 4414 regulation. The body is made of aluminium and covered with soft plastic, which give the couplings hardness, reliability and impact strenght. The button release device enables to replace quickly the air tool connected to power by simply pushing the button twice: the first time the button is pushed, the pressurized air inside the tool is released; the second time the button is pushed, the air tool is totally safely disconnected from the coupling.