nitrile-waterstop manhole connector

Nitrile Waterstop

Nitrile Waterstop stops soil and water infiltration through pipe-to-structure penetrations when a flexible connector conforming to ASTM C 923 cannot be used. A Nitrile Waterstop is used when there is concern about the connector coming into contact with petroleum based compounds or solvent based compounds.

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Features and Benefits

  • Specially developed synthetic nitrile rubber is continuously tested and lab-certified to ASTM C 1619 CLASS D.
  • Provides better seal than mortar joint alone.
  • Can be used with existing structures, new precast structures, or new poured-in-place structures.
  • Easily adapts to field conditions.
  • Prevents infiltration/exfiltration between pipe and grout.

How It Works

  • Used when there is concern about petro or solvent based compounds coming in contact with the gasket.
  • Stainless steel clamps secure the Nitrile Waterstop to the pipe.
  • Hole size required is 4” to 6” larger than the pipe OD.
  • The rubber component is placed within the structure wall and with the clamp placed straight across the confinement area.
  • The pipe is placed in position and grouted in place using non-shrink patching compound or;
  • The pipe is placed in position in the formwork and the structure is poured around it.
  • After the mortar or concrete has set, the structure can be backfilled.

This manhole connector meets or exceeds the material physical property requirements only:

  • ASTM C 923
  • ASTM C 443 (Oil Resistance)
  • ASTM C-1619 CLASS D
  • ASTM C 1478
  • ASTM F 2510
Download Specifications
  1. A nitrile Waterstop grout ring shall be employed in the connection of storm water pipes and other nonwatertight applications to precast concrete or poured-in-place structures to control infiltration and exfiltration and to meet the requirements of ASTM D 2321 Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications, Section 7.10-Manhole Connections.
  2. The nitrile Waterstop connector shall consist of a rubber gasket and an external take up clamp to secure the Waterstop to the pipe before grouting or pouring in place. The rubber Waterstop shall be constructed solely of synthetic or natural rubber and shall meet and or exceed the physical property requirements of ASTM C923, ASTM C 1478, and ASTM F 2510.
  3. Minimum thickness of the cross section shall be 0.30-inches (7.6mm) and a minimum of 3-inches (76.2mm) in length. The key lock portion shall extend into the concrete a minimum of 1.5-inches (38mm) to provide an adequate anchorage for mortar. Non-shrink grout shall be placed around the entire Waterstop and maintain a minimum thickness of 2-inches (50mm) between the rubber gasket and any existing or hardened concrete to permit proper consolidation around the Waterstop connection.
  4. The external take-up clamp shall be constructed of Series 300 non-magnetic stainless steel and shall utilize no welds in its construction.
  5. Selection of the proper size Waterstop and any in field testing requirements shall be in strict conformance with the recommendations of the Waterstop manufacturer. The Waterstop Grout Ring shall be WS-30 Series Waterstop as manufactured by Press-Seal Corporation of Fort Wayne, Indiana or approved equal.