Industrial Pressure Gages,Glycerin Filled ,2-1/2" Dial, 0-1500 Psi/Kpa/bar Range, +/- 2.5% Accuracy, 1/4" Male NPT Connection, Bottom Mount,Brass Internal Parts,Stainless Steel Case,Crimped Bezel Ring Filled with glycerin and enclosed in a stainless steel 304 case for corrosion resistance Pressure Range with single (psi) or dual scale (psi/kPa)/(psi/bar)/(Hg. vacuum/kPa)/ (Hg. vacuum/bar) Brass wetted parts for measuring non-corrosive liquid and gas pressure Accuracy is + or - 2.5% of full scale value for the 1.5" (40 mm) and 2" (50 mm) gauges, 2.5" (63 mm) and + or - 1.6% of full scale value for the and 4" (100 mm) gauges Lower mount or center back male connection with 1/8", 1/4", or 1/2" NPT rate , estricted orifice