The Prevost PrevoS1 Safety Coupling 1/4" FNPT, No. pS1, is designed to improve user safety by protecting users from dangerous hose whip situations during disconnection of unsecured couplings. A custom o-ring seal offers a three-year leak-free connection and performance. The coupling is easy to identify by a color coded button that denotes plug profile, and the item number is printed on the body. The flow rate is optimized for pneumatic tools to provide consistent performance, and the coupling offers enhanced ergonomics for easy one-handed connection and disconnection.