The Freeman Z4B1414FFAC 4-Ball 1/4" x 1/4" Female to Female Automotive Coupler provides a strong connection for pneumatic tools and air hoses. The 4 ball connector gives a quick and secure connection while the in-line valve keeps the nose pressurized when disconnected and reduces whip. This air tool accessory uses high quality zinc construction for long lasting durability. Features include a female 1/4" NPT fitting, along with an easy to use 1/4" snap-in automotive style fitting containing a protective collar to prevent accidental disconnects.