This lot of 5 Winters PETG204 PET Series Steel Dual Scale Gas Test Pressure Gauges is a great addition to any business or industrial set-up. These gauges have a face diameter of 2 inches (50.8 mm), a connection diameter of 1/4 inch, and a bottom mount for easy installation. With a maximum pressure of 100 psi (6.9 bar), these gauges are ideal for monitoring air pressure in hydraulics, pneumatics, pumps, and plumbing systems. The gauges are manufactured by Winters, a trusted brand in the industry.