With air fittings (quick-compounds) can be easily and rapidly connected or disconnected to any pneumatic compressed air line. PT1819 - quick-release coupling with valve "mother" of the universal type, suitable for quick-links "Pope" of any species. On the other hand the outer fitting is equipped with a 3/8 inch ". The compound is made of brass with a comfortable grip of ABS plastic. Features easy to install conveniently remove Reliable connection