This coupling with stop meets the standards for ASME B16.22, ASTM B75 Alloy C12200, ISO 9001, MSS SP-104, NFPA 99, NSF/ANSI 61, UL, has a maximum operating pressure of 351 psi @ 200 Degrees F and is designed for the following applications: air, gases, potable water. It has an operating temperature of 20 Degrees F to 400 Degrees F, is resistant to dezincification and is made of C12200-grade wrot copper. In addition, it is a straight coupling.