The Ametek/US Gauge 138057A is a 845FF Series front flange gauge with a 200 psi pressure max, 3.5" dial size, 1/4" NPT center back mount connection, brass wetted material, and steel case material. Utilizing either front flanged or U-clamp cases, these attractive panel mount gauges can be flush mounted on instrument panels, pressure test stands, steam cleaners, sterilizers, and many other types of equipment. Where a minimum of space is available the 844 U-clamp series is more desirable. When it is desirable to mount the gauge from the front of panel, the 845 front flanged series may be specified. All models utilize a unique one piece plasti threaded ring and window which can be removed, permitting in-panel pointer adjustment. Optional stainless steel bourdon tube and socket for use where the pressure medium is corrosive to copper alloys is available.