The U.S. Gauge 1555, 1558 and 1559 are liquid fillable utility gauges designed for a wide range of rugged service applications on pumps, compressors, hydraulic systems, machine tools and petrochemical processing equipment. Gauges feature a corrosion resistant 300 series stainless steel case and ring, and durable polycarbonate window. Phosphor bronze Bourdon tube, brass movement, and socket connections are standard. They come in 1-½”, 2″ and 2-½” versions and are available in psi and bar, kPa, and kg/cm² metric ranges. Glycerin is the standard fill fluid, with silicone and mineral oil and dry available upon request.