Link-Seal® (United States and UK)

Link-Seal® modular seals are considered to be the premier method for permanently sealing pipes of any size passing through walls, floors and ceilings. In fact, any cylindrical object may be quickly, easily and permanently sealed, as they pass through barriers, by the patented Link-Seal® modular seal design.

Ductile iron, concrete, metal as well as plastic pipes may be hydrostatically sealed within walls to hold up to 20 psig (40 feet of static head). Electrical or telecommunications cable may be sealed within conduit as they enter vaults or manholes. The annular space between carrier pipes passing through casings may be sealed against the entry of water, soil or backfill material.

With a wide variety of hardware/elastomer combinations, Link-Seal® modular seals are easily configured to achieve the best possible match for service conditions encountered. High temperature seals, fire seals (Factory Mutual Approved) and oil resistant seals may be ordered to meet special or unique service applications. For the system approach, metal or non-conductive Century-Line® sleeves with water stops may be ordered with Link-Seal® modular seals to ensure correct positioning and a water tight seal of the installation within poured concrete walls.

Link-Seal® modular seals are also available for a wide variety of special applications, temperature extremes, exotic chemical combinations and for “out of round” or non-centered applications. Please contact factory for your special application.


Saves Time and Money
Link-Seal® modular seals install in up to 75% less time compared to lead-oakum joints, hand-fitted flashings, mastics, or casing boots.

Positive Hydrostatic Seal
Link-Seal® modular seals are rated at 20 psig (40ft of head), which exceeds the performance requirements of most applications.

Long Seal Life
Link-Seal® modular seals are designed for use as a permanent seal. Seal elements are specially compounded to resist aging and attack from ozone, sunlight, water, and a wide range of chemicals.

Maximum Protection Against Corrosion
Standard fasteners have a two-part zinc dichromate and proprietary corrosion inhibiting coating. Corrosion resistant 316 stainless steel available for maximum corrosion protection.

Factory Mutual Fire Approved. Also a wide variety of approvals from various Federal agencies, associations, code groups, laboratories, and organizations.

ISO Quality Assurance
Link-Seal® modular seals are manufactured in an ISO 9001:2000 certified facility.

Configure a Link-Seal® Modular Seal to Match Your Application
16 sizes, color-coded EPDM, Nitrile, and Silicone elastomers may be used with various hardware options to match performance characteristics with service conditions.

Other Link-Seal Resources 

  • Installation Videos - information and instructive video installation guides.
  • CAD Files -  these are available on our Literature  page in the   "Link-Seal® Modular Seals " section.
  • Link-Seal® Modular Seals Seal Finder  - Seal Finder calculates Link-Seal® Modular Seals with Century-Line® Sleeves, WS Steel Sleeves, Cast or Cored Holes and Cell-Cast® Disks.
  • Other downloadable files are located on the bottom right side of this page.

Related Products

  • WS Steel Wall Sleeves   -   A full circle water-stop plate acts as positive water seal and anchor to prevent thrust movement. GPT provides WS steel sleeves for all pipes passing through concrete or masonry structures.
  • Cell-Cast® Disks  -  Cell-Cast® Interlocking hole Forming Disks are designed to produce large diameter holes in poured concrete structures.
  • LineBacker® 61 NSF Certified Sealing System - Used and proven, for over 40 years! Sealing flanges within piping systems carrying potable water and other fluids in high/low temperature extremes - at high pressure ratings.

Detail Pages

Options -  Hardware and Seal Options for different locations

Typical Applications - Common configurations for sealing wall penetrating pipes

Options and Enhancements  - metric bolt and pressure plate models

Hardware Specifications  -  Materials , temperature ranges, configurations

Typical Configurations  -  Typical modular/mechanical seal and sleeve specification and warranty