1" Female NPT Steel Coupling. Used for a variety of applications, not limited to grease, fuels, refrigeration, water, oil gas, and hydraulic systems. Working pressure of 1000 PSI. Temperature 400°F Max. This requires sealants to complete a seal (such as teflon tape) Meets the standards of SAE corrosion resistance requirement. Plating meets ASTM B63, Fe/Zn 5. . Not deemed lead free. Not for use with potable water. Please Note: NPT Thread size is NOT determined by its outside thread diameter in inches. Please review our attached NPT sizing chart to cross reference NPT thread size to linear inches