Product Information Material: Zinc Plated Steel Female Thread: NPTF Male Thread: NPTF Select a Product Part NumberFemale Thread SizeMale Thread SizeWorking Pressure 5601-123/4"-143/4"-142500 PSI 5601-41/4"-181/4"-185000 PSI 5601-63/8"-183/8"-184000 PSI 5601-81/2"-141/2"-143000 PSI 5601-161"- 11-1/21"- 11-1/22000 PSI