FIGURE 1002 HAMMER UNION Nominal pipe Size:1, 2, 3, 4,5,6; Pressure Rating: 1 to 4 10000psi cwp;15000 psi test; 5 to 6 7500psi cwp;12000 psi test; Connections Type: pipeline thread, tubing thread, butt-weld; Component Parts: Nut, Male Sub, Female Sub, Seal Ring; Sour Service Models to NACE MR-01-75.