Skip to main content

External Sleeves

The External Divided Sleeve can be used in conjunction with the Link-Seal System to solve difficult pipe penetration challenges.

More InfoEnquire nowApplication & InstallTechnical Information

What are External Divided Sleeves?

The External Divided Sleeves are a two-piece split sleeve system that can be retrofitted around an existing pipe or cable to either side of a wall/bund. The Link-Seals are then installed to provide the permanent seal.

The External Divided Sleeve can be used in conjunction with the Link-Seal System to solve difficult pipe penetration challenges.

The External Divided Sleeve offers complete protection when the annular space is too small, when the core isn’t exact or doesn’t align with the pipe or cable. The base plate can also be customised during manufacture to ensure that it is anchored and sealed to the substrate securely.

The External Divided Sleeves are manufactured from S-304 Stainless Steel and come complete with all bolts, nuts and the appropriate rubber gasket that seal against a variety of chemicals like fuel, oil, water and gas.

Enquire Now

Benefits in using External Divided Sleeves:

  • Can be fitted around pipes or cables that are already installed & in use
  • Suitable for pipes from 50mm to 1600mm OD
  • Stainless steel base & collar for longevity
  • Easy and quick to install (No special tools required)
  • Can be re-fitted and re-used
  • EPDM or SBR rubber gasket seals to substrate
  • Two or more penetrations can be fitted on a single base plate

Application & Installation

Where/When the External Divided Sleeves can be Used?

The External Divided Sleeve is mostly used in situations where it isn’t possible to fit a Link-Seal assembly securely, for example:

  • When a pipe is not centered in a hole;
  • When the hole is out of round;
  • When the annular space is too small or too large for a Link-Seal assembly to fit;
  • When an existing penetration is leaking such as concrete & pipe or cast-in conduits, etc.
  • When an in-situ pipe requires a fire rating and/or cannot be removed and requires a 100% hydrostatic seal.


The most effective way to seal the between the External Steel Sleeve and the pipe is to use the Link-Seals.

The type of Link-Seals will be determined depending on the liquid or type of application, nl.

  • Model-S316 (EPDM) Link-Seals for sealing against non aggressive chemicals (water, gas and other inorganic liquids)
  • Model-O (Nitrille Rubber) Link-Seals to seal against Hydrocarbons and aggressive chemicals
  • Model-T Link-Seal (silicone rubber) when a fire rating is required (2 hrs (AS 1530.4 and AS 4072.1) fire rating (click here for certificate).

How to Install the External Divided Sleeves?

Step 1: Assemble both sections of the split sleeve around the pipe.

Step 2: Assemble by placing nuts & bolts through pressure plates and tighten just enough to keep assembly in place – Do not remove backing/protection paper attached to sealant & pressure plates at this stage.

Step 3: Put External Divided Sleeve in place against wall – centered to pipe (to help center the pipe you can install the Link-Seals).

Step 4: Mark the holes to be drilled.

Step 5: Remove External Divided Sleeve and Link-Seals if used – drill holes to fix dyna bolts.

Step 6: Remove backing paper from sealant, assemble both sections around pipe, insert nuts & bolts through pressure plates and tighten.

Step 7: Place rubber gasket between wall & back plate – fasten dyna bolts to permanently attached External Divided Sleeve to wall.

Step 8: Assemble Link-Seals to permanently seal the annular space.

Technical Information


The Projex Mission is to source and supply technically excellent products to meet the needs of owners, designers, insurers and operators of buildings and structures for specialist protection against water, industrial liquids, impact and corrosion risks.