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The basic difference between a coupling and a union is that coupling is for joining pipe to pipe or pipe to a swedge and the union is made for joining and disassemble a part of a piping system (a steam trap or control valve, etc) for maintenance or replacement. The use of couplings or unions is not a code issue.
Featured Wholesale male/female threaded union pipe fittings For
IEC 61386 Standard Rigid Coupling Union Conduit RGS 20mm 25mm 32mm
Size: 1-1/2 Approvals: UL/FM Class: 150#Dimensions (inches): A= 2.47 Class 150 pipe fittings are UL Listed and FM Approved at 300 psi Class 300 pipe
1-1/2 in. NPT Threaded Union (Brass Seat) - 150# Black Malleable Iron Pipe Fitting - UL/FM
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