::::Please Note::: 1/4" NPT MEASURES 0.54" OUTSIDE THREAD DIAMETER IN INCHES. USA Support USA Stock USA Services Dial Size: 2" Dial Size (Crimped Casing) Accuracy: +/- 4/3/4% Scale: Dual Scale - PSI / Bar Movement: Copper Alloy Bourdon Tube: Copper Alloy Case: Steel case for protection in harsh environments Connection: Copper Alloy Lower Mount; 1/4" NPT (for 2" dial) Normal Ambient Temp.: -4F to +140F (-20C to +60C) Color Coded: 0-125psi Green, 126-175psi Yellow, 176-200psi Red (Danger)