... pipe connector playing a role in connecting with pipe. The Hammer Union can be used for cementing trucks,all kinds of manifolds ... end connections of pipe line thread,tubing thread,butt-weld. Hammer Union:Nominal pipe size:2”, 2-1/2”,3”,4”,6 ... service:Manifold and line connectionFeatures:Pressure-tight make-up with hammer,Economical,low-pressure union Hammer Union