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 Dresser Coupling Style 38 Style 65 Style 90 Trupply 1 2" STY#65 GALV CPLG LONG Dresser 1 2" Style 65 Galvanized Male Adapter Wal Rich Corporation 24 inch 24" Dresser type 38 pipe pipeline clamp coupling 600mm