Internal Joint Seals

internal-seal_exampleThe NPC Internal Joint Seal economically eliminates groundwater infiltration from offset, corroded, cracked or deflected pipe joints and manhole barrel joints. The Internal Joint Seal prevents infiltration by bridging the joint with a flexible rubber seal and compressing the rubber against the pipe wall using the unique WedgeLock Expansion Bands without expensive special tools.

The NPC Internal Seal is extruded from premium quality rubber and is available in three widths. The 7.5 inch seal is wide enough for most joint repairs. If the leaking joint is offset or deflected the 10.5 inch seal provides a wider sealing area. An extension is available for sealing even wider areas.

  • WedgeLock Expansion Bands provide uniform distribution of sealing force
  • Quickly Installed by contractors or municipal employees
  • Seals available for Pipe Diameters from 18″ to 122″
  • Internal Joint Seals can be installed in Concrete, Smooth Wall HDPE, PVC, FRP, Steel, Clay and Cast Iron
  • Elliptical and Arched Internal Joint Seals available upon request
  • Nitrile seals for extreme environments may be special ordered

Click her for the Internal Joint Seal Data Sheet
Click here for the Internal Joint Seal Installation Instructions
Click here for the Internal Joint Specification