The Coilhose Pneumatics 5-in-1 Automatic Safety Exhaust Coupler reduces the possibility of injury and damage from a whipping hose that is disconnected while pressurized air is still in the line. The coupler is designed to stay connected to the plug until the downstream air is completely bled off. The coupler easily connects under zero pressure and safely disconnects without hose whip. The coupler is ideal for industrial and automotive interchanges. For high-vibration applications it is recommended to use a lead-in hose to lengthen the life of the coupler.