Smith Blair 1 2in Galvanized Compression Dresser Coupling 525 0000840 Dresser coupling flexible coupling pipe fittings 1200 universal coupling Bolted Sleeve Type Couplings for Plain End Pipe OKVAL brand bolted sleeve couplings are used to join Plain End Pipe ,okval dresser coupling design has sleeves which slide over the pipe ends to which Wal Rich 2804008 1 1 4 inch IPS Style 65 Water Service Compression Dresser Coupling for Steel Pipe