This union fitting is for connecting and disconnecting two pipes more easily than couplings. This fitting is made of 304 stainless steel for higher strength and greater corrosion resistance . This fitting has hex nut construction for tighter, leak-free connections. It is compatible with stainless steel, copper, rigid and semi-rigid plastic tubing, but is not recommended for soft tubing. It is suitable for use in chemical, petroleum, power generation, laboratory, and medical device plants.