This Marsh Equipment Co. gauge is a reliable and accurate measurement tool for air pressure in a range of applications. With a face diameter of 2.5 inches and a connection diameter of 1/4 inch, it is designed for bottom mounting and is suitable for use with ammonia and other gases. The gauge has a maximum pressure of 400 psi (27.6 bar) and is made in the United States. Ideal for use in business and industrial settings and is classified under the categories of Air Pressure Gauges, Hydraulics, Pneumatics, Pumps Plumbing, and Business Industrial. Pre-owned, normal use with minor cosmetic wear on casing. Worked as suppose to last time installed. Not tested. See pics for detail. [e-10]