... :Case: SUS304, carbon steel, engineering plastics 3:Thread: SUS304 4:Movement: Brass Waterproof CNG Pressure Gauge is fixed on the intake valve ... : 2.53). Case diameter: 50mm/2''. Or, your customized size.4). Measurement range: 0~400bar/0~6000psi, (psi, kpa, mpa, bar ... ) Bourdon tube: SUS316L or bronze c) Thread: SUS304 or brass d) Movement: Brass or SUS304e) Dial and pointer: Aluminumf) Window: PC lens ...