MacWrap for RCP

External C-877 Type II compliant coupler for RCP joints.

External seals for reinforced concrete pipe joints

MarMac’s MacWrap for RCP is used for external seals for reinforced concrete pipe. It’s an advanced external joint coupler specifically designed for preventing infiltration at connections of reinforced concrete pipe, manhole sections, box culverts and many other round or elliptical concrete structures.

  • MacWrap is reinforced rubberized mastic external sealing bands with integrated mechanical compression straps that are used to seal the joint between two sections of reinforced concrete pipe. The rubberized mastic is formulated to adhere aggressively to all known concrete 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. The minimum length of the coupler is the circumference of the outside diameter of pipes to be sealed and an additional eight inches (8″) for overlap. Two layers (minimum) of rubberized mastic (0.120″ thick) with a sheet of strong puncture resistant woven polypropylene with an outside backing of cross-laminated polyethylene resistant to acids and bases.
  • MacWrap exceeds ASTM C 877 (Type II), the industry standard for external joint seals for RCP and structures. Our specially formulated mastic provides a full perimeter positive seal against infiltration and exfiltration. MacWrap is reinforced by internalized woven polypropylene with a heavy duty polyethylene backing and secured with tensioning ratchets. MacWrap is appropriate for bell-and-spigot as well as tongue and groove applications.


  • Bell-and-spigot
  • Tongue-and-groove
  • Above-ground applications available with UV-resistant backings


  • Strong
  • Permanent
  • Shear & puncture resistant
  • Easily installed
  • Infiltration & exfiltration proof


  • No open flames or heat source needed
  • No special tools needed
  • No glues or adhesives needed
  • Instantly adheres
  • Immediately ready for backfill
  • Primer not typically needed

Tell us about your application and let our experts help find the best solution for your situation—and send you a free quote!

Also ask about MacWrap for Manholes and Box Culverts.
MacWrap Diagram

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