... playing a role in connecting with pipe. The Hammer Union can be used for cementing trucks,all kinds of manifolds ... fracturing fluid and mixed fluid.These poroducts are all made of high quality steel by forging and fishing cut, ... of pipe line thread,tubing thread,butt-weld. Hammer Union:Nominal pipe size:2”, 2-1/2”,3”,4”, ... Pressure-tight make-up with hammer,Economical,low-pressure union Hammer Union