D&K Site Check Valves & Clearvue Dresser Couplings Pipe Joining Products 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 Flexible Dresser Coupling with Universal Compensation for Piping Universal Coupling and Ductile Iron Joint Valve Parts Archives Lake Company Pipe coupling Dresser type Viking Johnson Helden Industrial Webshop