The Freeman Z4B1414FFIC 4-Ball 1/4" x 1/4" Female to Female Industrial Quick Connect Coupler provides a strong connection for your 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. The light weight of the parts reduces fatigue while working. Features include a 1/4" NPT fitting along with a 1/4" snap-in industrial style fitting for easy use, as well as a protective collar to prevent accidental disconnects.