LIQUID/GLYCERIN FILLED GAUGES ARE SPECIFICALLY DESIGNED FOR APPLICATIONS WHERE VIBRATION AND PULSATION IS PRESENT CENTER BACK MOUNT GLYCERIN FILLED PRESSURE GAUGE, FACE/DIAL SIZE 1-1/2", 1/8" MALE NPT CONNECTION, 0-1000 PSI RANGE PLEASE NOTE: 1/8" MALE NPT MEASURES 0.405" OUTSIDE THREAD DIAMETER. THESE ARE INDUSTRIAL GAUGES AND NOT DEEMED LEAD FREE. DO NOT USE WITH POTABLE WATER APPLICATIONS. GLYCERIN FILLED, POLYCARBONATE LENS, STAINLESS STEEL CASE & BEZEL, COPPER ALLOY INTERNALS, BLACK ALUMINUM POINTER, DESIGN MEETS OR EXCEEDS ASME B40.100 PRESSURE GAUGE STANDARD 3/2/3% ACCURACY, AMBIENT TEMPERATURE -50f TO 160f, SEE ADDITIONAL PICS FOR DIMENSIONAL DATA, PSI/BAR THESE ARE INDUSTRIAL GAUGES AND NOT DEEMED LEAD FREE. DO NOT USE WITH POTABLE WATER APPLICATIONS. APPLICATIONS INCLUDE OIL, WATER, AIR, COMPRESSOR, HYDRAULICS, HVAC, GASEOUS & LIQUID MEDIA THAT ARE NOT HIGHLY VISCOUS OR CRYSTALLIZING AND NOT CORROSIVE OR OXIDIZING TO COPPER ALLOY PARTS. INDUSTRIAL GAUGE SPECIFICATIONS_ LENS: PLASTIC, WETTED PARTS: COPPER ALLOY, CASE: STEEL, POINTER: BLACK ALUMINUM, ASME B40.1 GRADE B