THIS STAINLESS STEEL GAUGE IS IDEAL FOR USE IN STATIC APPLICATIONS. WETTED PARTS ARE MADE FROM A BRASS COPPER ALLOY. STAINLESS STEEL CASE AND WHITE ALUMINUM DIAL PROVIDE DURABILITY AND STRENGTH. HAS A LOWER MOUNT 1/4"" NPT CONNECTION AND A REMOVABLE SNAP-OFF ACRYLIC WINDOW. AMBIENT OPERATING TEMPERATURE RANGE IS -40 TO 140 degreesF. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov - Nickel (Metallic)