Garlock’s LINK-SEAL modular seals (models LS-200 through LS-650) are widely used to create permanent, hydrostatic seals around pipes and conduits where they pass through walls, floors, and other barriers.
These modular seals, made from interlocking rubber links compressed by bolts, provide a gas- and water-tight seal that withstands up to 20 psi of water pressure, exceeding typical construction requirements.
Note: If you don’t see the size or combination you need listed, contact Maddock to determine the right fit. We can configure any standard or custom sizing, and our in-house experts can create solutions even for uncommon applications.
Most Popular LINK-SEAL Sizes & Applications
The most frequently ordered LINK-SEAL sizes include LS-300, LS-410, and LS-475, which cover common pipe diameters like 1″, 2″, 4″, 6″, and 10″. Among these, 2-inch and 4-inch electrical conduit penetrations using LS-300 seals are some of the most common applications.
These seals are especially popular among electrical contractors who install underground conduit in structures such as data centers, commercial buildings, and utility facilities. After drilling a core hole through the building’s concrete wall, the conduit is run through, and a Garlock LINK-SEAL wall penetration seal is used to create an airtight and watertight seal, protecting against water, dirt, and debris.
Here are other common use cases across industries:
1. Concrete Wall & Floor Penetrations
LINK-SEALs are ideal for sealing around pipes that pass through poured concrete in commercial, industrial and municipal buildings. They are more reliable and longer-lasting than caulking or grout, making them the preferred solution for utility penetrations.
2. Municipal Water & Wastewater Plants
In these settings, pipes carry water, stormwater, or sewage, so corrosion resistance is critical. Stainless steel hardware is preferred for its ability to withstand continuous moisture and chemical exposure. EPDM rubber seals provide resistance to sewage and treatment chemicals.
3. Utility Vaults & Manholes
Pipes and conduits entering underground vaults or manholes often require sealing. Moisture and standing water are common, so stainless steel hardware is frequently chosen over carbon steel for long-term performance.
4. Industrial Facilities
Process water, compressed air, and cooling lines in factories often run through walls or floors. Where chemical exposure is minimal, carbon steel is used. For more aggressive environments, stainless steel and specialty elastomers, such as nitrile, are preferred.
5. Data Centers & Telecom Facilities
These high-reliability facilities frequently use LINK-SEALs to protect fiber optic and power conduit banks. Electrical loads are high, and underground entries are common, so LS-300 seals on 2″ and 4″ conduits are frequently specified.
6. Parking Garages & Basements
High humidity, salt, and water exposure make stainless steel hardware a smart choice for sealing plumbing and drainpipes in these environments. LINK-SEALs help prevent water leaks and corrosion.
7. Fire Protection Systems
Sprinkler pipes that pass through concrete are often sealed with stainless steel LINK-SEALs for added durability. In some cases, fire-rated silicone rubber seals are required to meet spec.
8. Chiller Plants & HVAC Systems
Chilled water and condenser pipes are prone to condensation. Stainless steel hardware resists rust caused by constant sweating, preserving the seal and surrounding structure.
9. Renewable Energy Installations
At solar farms and wind turbine sites, LINK-SEALs protect cable entries into outdoor enclosures. Stainless steel is standard for handling exposure to weather and UV.
10. Food & Beverage Facilities
For non-washdown utility areas, stainless steel LINK-SEALs provide hygienic, corrosion-resistant seals. EPDM or nitrile rubber options are used depending on chemical exposure.
Quick Reference Table:
| Application | LINK-SEAL Use | Hardware Material |
|---|---|---|
| Concrete wall/floor penetrations | Very common | Carbon or Stainless |
| Water & wastewater plants | Very common | Stainless preferred |
| Utility vaults & manholes | Very common | Carbon or Stainless |
| Industrial cooling & HVAC | Common | Stainless often used |
| Parking structures & basements | Common | Stainless recommended |
| Fire protection piping | Common | Stainless often required |
| Data/telecom conduit entry | Very common | Stainless preferred |
| Renewable energy installations | Growing use | Stainless standard |
| Food & beverage (non-washdown) | Limited | Stainless for hygiene |
Whether you’re working with standard sizes, such as 2″ or 4″ electrical conduits, or need a custom configuration, Maddock Industries is here to help. Use carbon steel for dry environments and upgrade to stainless steel for applications requiring resistance to moisture, chemicals, or those with specific longevity requirements.
If you don’t see what you need listed, give us a call – we’ll help configure the right solution.
