Use this pressure gage for reliable service with compressors regulators air lines pneumatic tools and equipment. Made up of brass mechanism ABS case and a polycarbonate lens this gage 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 gage has a bottom mount and offers a pressure range of 0 to 300 PSI. 2 face diameter.