WESG-544H Features: -Cylinder Pressure testing 2'' brass gauges with Western hand-tight nuts in brass or with plastic grip. All brass nuts are machined to CGA specifications and are designed with wrench flats.. -WESTERN. -Safety First Western strongly encourages users of compressed gases to adhere to all safety guidelines and practices. Only an absolute and constant respect for compressed gases is acceptable for safe operations. Refer to the Western safety products such as check valves, flash arrestors, and relief valves.. -UNSPC CODE: 23171500. Generic Specifications: -TEST GAUGE CGA540 W/HT NUT.