The Ametek/US Gauge 255432 is a 1980 SOLFRUNT Series process gauge with a 160 psi pressure max, 4.5" dial size, 1/4" NPT lower mount connection, brass wetted material, and plastic case material. The Model 1980 4.5" process gauge has a PET turret style case for chemical and petrochemical processing applications. The PET material gives this case superior impact strength and a broad spectrum of chemical resistance. This model is available with wetted surface material in brass/phosphor bronze. They are available dry or liquid filled from the factory or your local stocking distributor and come with a liquid fill kit, or the E-Z Fill design to facilitate filling in the field without special tools.Span adjustments can be accomplished from rear of case without disturbing the gauge internals. Pointer adjustments are easily made by removing ring and window.