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OPW DPC-2300A 3'' Double-Wall Swivel Pipe Coupling is a proven coupling and fitting system designed exclusively for use with FlexWorks Piping. This pipe connection system includes an internally expanded stainless steel coupling attached to the end of a FlexWorks pipe section. The swivel coupling has a smooth sealing face fitted with a Viton® ring gasket. Double-wall swivel couplings eliminate the need for cutting back the secondary jacket and rubber test boots. They have an integral interstitial access port for connector and test tubes. These double-wall couplings permit higher interstitial testing pressures and eliminate added parts and labor costs.