The HMP Single Stage Double Gauge Argon Gas Pressure Regulator (50-D-AR PROUD) features a brass body and aluminum bonnet for durability, with dual gauges for precise inlet/outlet pressure monitoring. Designed for argon gas applications, it includes a sintered metal inlet filter, neoprene/silicone diaphragm (typically used in similar HMP models), and safety mechanisms for reliable pressure control in industrial settings.