The Ametek/US Gauge 150211 is a 1901 SOLFRUNT Series process gauge with a 300 psi pressure max, 4.5" dial size, 1/2" NPT lower mount connection, brass wetted material, and aluminum case material. The Model 1901 process gauges have an aluminum back-flanged case for applications needing stem or wall mounting. These models are available with wetted surface material in brass/phosphor bronze or 316L stainless steel. They are available dry or liquid filled from the factory or your local stocking distributors, or can be ordered with a liquid fill kit for filling in the field. Model 1901 SOLFRUNT gauges are supplied in 18 vacuum, compound, and pressure ranges from 30" Hg vacuum through 11600 psi. The low-connected aluminum back-flanged case can be easily liquid filled in the field using the appropriate conversion kit.