4-piece Industrial/Milton® compatible 1/4 in coupler, nipple and plugs kit. The coupler is constructed of lightweight, durable brass with sleeve guards to prevent accidental disconnects and (6) ball bearings to ensure a long-lasting, snug, leak-free fit. The nipple is constructed of durable brass. The plugs are constructed of heat treated industrial-grade steel. All included fittings have a 300 psi maximum working pressure, air flow of 43 scfm and a temperature range of -40 to 230 deg F. This 4-piece kit is ideal for making it easy-to switch quickly between different air tools and accessories during job applications.