... manifolds and lines. Features Economical, general-purpose union; Butt-weld available. 3, Figure 206 Hammer Union Nominal pipe Size:1, 2, 3,4 ... ,6,8, 10; Pressure Rating:2000psi cwp;3000 psi ... ; Connections Type: pipeline thread, tubing thread, butt-weld; 8, Figure 1003 Hammer Union Nominal pipe Size:2, 3, 4,5; Pressure Rating ...