specification
Dial Size:  1-1/2", 2", 2-1/2" or 4"
Accuracy: ±3-2-3% ANSI Grade B
±2-1-2% ANSI Grade A (4" SS only)
Case: 304SS
Bezel: 304SS Crimped
Socket: Brass or 316SS
Bourdon Tube: Brass or 316SS
Movement:  Brass or 316SS
Lens:  Polycarbonate
Pointer: Aluminum
Dial: Heavy Gage Aluminum
Connection:  See How to Order Chart
Restrictor:  Brass only
Industry Standard: ASME B40.1