Bronze general purpose pressure regulators resist wear, corrosion, steam, chemicals, and high temperatures. They contain copper, tin, and other materials and are suitable for air, water, and other noncorrosive media.

Brass general purpose pressure regulators resist corrosion and are built to withstand high temperatures. They are commonly used with air, water, and other noncorrosive media.

Cast-iron general purpose pressure regulators are extremely strong and durable and resist high temperatures, pressure, and vibration. They are suitable for use with air, gas, and vapors.

Stainless steel general purpose regulators resist corrosion and are suitable for use in harsh environments where there is exposure to moisture or chemicals. They are commonly used with both air and water.