CMP Couplers

External couplers for corrugated metal pipe.

Join/Restrain Corrugated Metal Pipes

MarMac CMP couplers are engineered to join/restrain corrugated metal pipes while preventing infiltration into the system. With hundreds of designs to cover virtually any scenario, MarMac CMP couplers have sealed thousands of connections between different sizes and types of pipe.

  • CMP couplers are reinforced rubberized mastic external sealing bands with integrated mechanical compression bands that are used to seal a butt joint connection between two different types/outside diameters of pipe. The rubberized mastic is formulated to adhere aggressively to all known pipe surfaces. Additionally, the integrated compression bands mechanically seal and form a permanent bond to the pipe wall. The woven polypropylene component provides shear and puncture resistance. Minimum length of coupler is the circumference of the larger outside diameter (if applicable) and an additional eight inches (8″) for overlap. Three layers of rubberized mastic (0.180″ thick) with a sheet of strong puncture resistant woven polypropylene with an outside backing of cross-laminated polyethylene resistant to acids and bases.
  • MarMac CMP couplers meet or exceed the material requirements of:

-ASTM D 882 (Method A), ASTM D 624 (Die C), ASTM D 570, and ASTM D 1682.

  • In a laboratory setting, our coupler has been third party tested to prevent infiltration into the joint when the joint is subjected to 30 feet head pressure (13 psi) per ASTM C 877-09, as well as hold 22 inches mercury (74 kPA) internal vacuum with no leakage detected per ASTM D 3212.

MarMac CMP couplers are easy to install, cost-efficient, permanent, and readily available. Our dedicated production line and our unique manufacturing system allow us to quickly ship small or large quantities of couplers custom designed specifically for almost any type and size of pipe you encounter in the field. Many couplers are available for shipping the same day the order is placed, and we regularly ship to job sites and drop ship directly to customers or end-users.

Tell us about your application and let our experts select the perfect coupler for your situation.

Also ask about our Dissimilar Pipe Couplers.

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