Pressure Gauges are ideal for continuous service on applications like compressors, pumps,regulators, pipelines, storage tanks and plumbing equipment, as well as for replacements on mostcommercial and industrial equipment. All connections are made of brass and are male NPT.Monroe Gauges are designed around the “C” type bourdon tube that is among the longest in theindustry. This extra length provides a thicker wall for more pressureresistance with little effect on flexibility. The tube material is a copperalloy. Cases are made of steel and lenses are made of plastic.