... thread, butt-weld; Component Parts: Nut, Male Sub, Female Sub, Seal Ring; Sour Service Models to NACE MR-01-75. Recommended ... and line connections, suction service, and corrosion service. Features O-ring in male sub improves sealing and protects metal-to-metal ... weld; Component Parts: Detachable Nut, Male Sub, Female Sub, Seal Ring, Retainer Segment, Retainer Ring; Sour Service Models to NACE MR-01-75 ...