Use this pressure gauge for reliable service with compressors, regulators, air lines, pneumatic tools and equipment. Made up of a brass mechanism, ABS case and a polycarbonate lens, this gauge is resistant to heat, corrosion, water, salt water and oil. Can also be used in steam applications if less than 120 degrees Fahrenheit. The 1/4" NPT pressure gauge has a center back mount and offers a pressure range of 0 to 100 PSI. 1 1/2" face diameter. 1/4" NPT Center Back Mount Pressure Gauge