The Ametek 656256058 2.5 in. Pressure Gauge, 0-100 psi, 1/4 in. NPT, Lower Mount provides users with a number of advantages in certain measurement applications. This model is ideally suited for uses on equipment where excessive vibration and pulsation are encountered, such as pumps, compressors, machine tools, etc. The liquid fill minimizes the effect of these severe environments, protects the gauge internals, and provides continuous lubrication on the mechanism, all adding up to extended service life. Liquid filling also provides greater protection of the gauge internals from corrosive atmospheres. AMETEK liquid filled gauges can be used with a variety of fill fluids including glycerin, mineral oil, and silicone oil. The 656-256058 gauge is made with seamless 316L SST Bourdon tubes, which reduces concerns about tube fatigue and stress corrosion cracking.