SAFETY: Uses DOUBLE CHICK to engage properly----First chick locks coupler and plug; Second chick engage air pressure. When disconnecting, first chick will relieve air pressure; Second chick allows coupler and plug to be safely disengaged.

UNIVERSAL: Now one safety coupler fits THREE air line plugs: Industrial/Milton Style, Tru-Flate Style, ARO Style

The resistant plastic sleeve not only prevents sensitive surfaces from scratching, but also makes it easier to operate in the cold.