411 Steel Coupling for Steel Pipe - 2"Smith Blair 411 Steel Coupling for Steel Pipe 2" A bolted sleeve type coupling for joining plain end pipe of the same diameters. Smith Blair Steel Couplings offer many distinct advantages when installed in a piping system. Properly selected and installed flexible couplings maintain the continuity of the pipe system, retain the line contents under internal pressure and prevent infiltration under vacuum. Our couplings consist of one cylindrical sleeve
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