... oil. Water, fracturing fluid and mixed fluid .The Hammer Union type mainly consists of Figure 100, Figure 200, Figure 206,Figure 400, Figure ... , Figure 1002, Figure 1003,Figure 1502 andFigure 2002. 1, Figure 100 Hammer Union Nominal pipe Size:2, 2-1/2, 3, 4 , 6 ... connections. Features Pressure-tight make-up with hammer; Economical, low-pressure union 2, Figure 200 Hammer Union Nominal pipe Size:1, 1-1/4 ...