Product Information Material: Zinc Plated Steel Female Thread: NPTF Select a Product Part NumberFemale Thread SizeWorking Pressure 5406C-123/4"-142500 PSI 5406C-241-1/2"- 11-1/21000 PSI 5406C-63/8"-184000 PSI 5406C-161"- 11-1/22000 PSI 5406C-81/2"-143000 PSI 5406C-21/8"-275000 PSI 5406C-201-1/4"- 11-1/21150 PSI 5406C-41/4"-185000 PSI