K4225 Pressure Gauge Pressure 2-1/2 in 0 to 100 psi Connection Size 1 in MNPT Connection Location Bottom Smallest Graduation 2 psi Graduations 20 psi Accuracy 1.6 Percent Case Material 304 Stainless Steel Case Color Silver Socket Material 316 Stainless Steel Tube Material 316 Stainless Steel Filled With Glycerin Lens Material Plastic Ring Material Polished Stainless Steel Operating Temp Range -30 Degrees to 200 Degrees F Characteristics Heavy Duty