The Trerice 450SS4504LA040 is a 450 series process gauge with a 30" Hg to 60 psi pressure max, 4.5" dial size, 1/2" NPT lower mount connection, stainless steel wetted material, and plastic case material. The Trerice 450 Series Process Gauge is designed for the petrochemical and industrial process industries. This solid front, blow-out back gauge is noted for its fiberglass reinforced polypropylene turret case and screwed ring; its sturdy interior design; and its field liquid-fill capability (no kit required). The 450 Series can withstand the most rugged industrial applications, while maintaining precise accuracy. Wetted parts are bronze tube/brass socket or stainless steel.