Image Cruceta Macho x Hembras NPTF Markets Maintenance Repair Operations (MRO) Product Options Part Number Female Thread Size Male Thread Male Thread Size Female Thread Material 5655-4 1/4”-18 NPTF 1/4”-18" NPTF Zinc Plated Steel 5655-6 3/8”-18 NPTF 3/8”-18" NPTF Zinc Plated Steel 5655-8 1/2”-14 NPTF 1/2”-14" NPTF Zinc Plated Steel