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Innerlynx® wall penetration seal



Innerlynx is the solution that guarantees perfect leak-tightness where a pipe penetrates a wall or bulkhead.

The Innerlynx wall penetration seal is composed of flexible EPDM links assembled together by bolts made from grade 1.4401 (316) authentic stainless steel. It goes around the pipe and a seal is formed by tightening the screws: the elastomer is compressed and sandwiched between the pipe and the wall.

Innerlynx is suitable for all kinds of pipe (steel, asbestos, concrete, cast iron, stoneware, HDPE, PVC, Polyester, PP), for pipe sizes from 20–3000mm nominal diameter, and for any solid bulkhead (brick, concrete etc). (Would question use with HDPE since that material creeps under load and will cause a leak in long term)

Our Innerlynx penetration seals can withstand 2.7 bar external pressure and temperatures from −40°C to +140°C. They have very high UV and ozone resistance. They are ideal for sealing around pipes entering tanks and entering basements below ground water level.

As an optional extra, our Innerlynx seals can be supplied in nitrile for better resistance to hydrocarbons or in silicon rubber for resistance to extreme temperatures from −55°C to +204°C (please enquire).

To help define the right link assembly for your bulkhead seal, use our calculation spreadsheet (see below).

Installation / Application


The installation method for bulkhead seals is very simple.

After drilling or casting a hole, (enquire with us for the various accessories), first position the pipe. It must be central in the hole and supported on either side of the wall. Innerlynx is not designed to act as a pipe support.

Next wrap the chain of Innerlynx links around the pipe and connect the ends together. At this stage verify the bolts are oriented correctly: the bolt heads must be located facing the operator. Do not be tempted to remove links: some play is normal.

Take up the slack on the Innerlynx seal if necessary using a ratchet wrench or equivalent, applying up to two full turns to each bolt.

Now slide the Innerlynx into the annular cavity between the pipe and the wall penetration. Start tightening, beginning with the bolt located at the top of the ring. Keep tightening until the rubber element starts to “swell”.

Continue tightening, bolt by bolt, in order to obtain the same preliminary tightening load on each element.

Finish off with a “final squeeze”: start again with the bolt at the top of the ring and tighten up to the recommended torque.

When installation is complete, check the elements have been uniformly tightened and make good contact with the wall.

1. tl_files/produits/innerlynx/innerlynx-montage1.jpg  2. tl_files/produits/innerlynx/innerlynx-montage2.jpg  3. tl_files/produits/innerlynx/innerlynx-montage3.jpg


Ref Tolerances Length Wall width ND
Mini Maxi Unit Mini <100 100-250 250-300 >300
IL200E 13 16 29 57        
IL275E 17 20 23 57        
IL300E 18 22 38 76        
IL315E 21 26 37 76        
IL325E 24 30 79 102        
IL340E 25 34 41 102        
IL360E 31 42 53 102        
IL410E 36 46 67 127        
IL400E 36 46 92 127        
IL425E 29 38 92 127        
IL475E 41 51 67 127        
IL500E 60 71 98 127        
IL525E 56 64 98 127        
IL575E 47 60 79 127        
IL600E 81 102 152 152        
IL650E 68 81 106 140        

Dimensions in mm