Pipe coupling Dresser type Viking Johnson Helden Industrial Webshop 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 Smith Blair 441 Omni Cast Dresser Coupling 12in 13.20in 13.50in Range Dresser 4" Style 711 Bolted Couplings for IPS Steel Wal Rich Corporation