JCM Ductile Iron Couplings employ the mechanical compression joint principle to join two pieces of plain end pipe. This stress receiving flexible joint eliminates precise cutting and fitting in the field while providing for deflection, limited expansion-contraction, pipe settlement and a quick easy means of disassembling the system for maintenance. JCM Ductile Iron Bolted Couplings meet or exceed the ANSI/AWWA C219 Standard as applicable.