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Flexible sealing around pipe conduits

Pro Clima Extoseal Magov

Stock code: PCMAGOV60
Manufacturer code: 14343
Stock code: PCMAGOV100
Manufacturer code: 14344

Pro Clima Extoseal Magov

Flexible airtight tape for use on penetrations in membranes

Tape size:

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  • Product Overview
  • Technical Details
  • Installation guide

Main purpose

For the airtight sealing of pipes that penetrate the airtightness or windtight layer of a building and to airtight seal walls to a floor.

Use it on

Timber, wood-based panels, metal, foil, polythene, sheathing, brick and concrete surfaces.


Pro Clima Extoseal Magov is a highly flexible and mouldable butyl rubber airtightness tape. This material is used in the airtight sealing of penetrations in airtight and windtight membranes and for airtight sealing between a wall and floor.

Due to the high flexibility of this tape, it can be easily moulded and stretched around pipes and cables in order to ensure no air leakage occurs. This ensures a quick and easy application process.

Where to use it

Extoseal Magov will permanently stick to all Pro Clima membranes, tapes and airtight accessories. It will also permanently stick to timber, wood-based panels, metal, foil, polythene, sheathing, brick and smooth concrete surfaces. Some mineral or masonry surfaces may require Tescon Primer RP or Tescon Sprimer to be applied to stabilise the surface first. 

What it does

Extoseal Magov is a highly flexible, stretchable and mouldable airtightness tape, most commonly used for the airtight sealing of pipe and cable penetrations in airtight & windtight membranes. It can also be used to seal the join between a concrete floor and a wall.

It has two release strips to make it highly effective when the two surfaces being sealed are at different angles, form a corner or right angle or are curved.

Why we love it

Due to its strong butyl rubber adhesive layer and its elastic top surface (carrier film), Extoseal Magov airtight tape can be highly stretched and moulded around any sized pipe or cable penetration. There is almost no restoring force to bring the tape back to its original unstretched state. This ensures a permanent airtight seal that can’t fail due to contraction of the tape. 

Extoseal Magov can be bonded to a huge variety of surfaces and can be used to seal pipes and cables when Airtight grommets are not available or cannot be used. This is especially useful in retrofits when the ends of the pipes and cables cannot be accessed to slide on a grommet.

How it works

Extoseal Magov penetrates deep into the substrate due to the extreme adhesive abilities of its butyl rubber. Once stretched to seal round pipes, cables and structural timbers, it does not retract to its original form ensuring a reliable airtight seal is achieved.

System warranty

Pro Clima provide a limited system warranty, backed-up with public liability insurance, for all airtightness system, roof and wall sealing system and construction products that they supply. A 10-year warranty is provided for these products when correctly installed in combination with approved thermal insulation materials and other Pro Clima system products. When correctly installed in combination with other manufacturers’ products (not made by Pro Clima), a 6-year warranty is provided.


  • Highly elastic & mouldable
  • UV protected
  • Quick & Easy to apply
  • Impervious to water


  • Extremely stretchy without the worry of affecting its airtight seal.
  • Can be used internally & externally & exposed to UV light for up to 3 months.
  • Perfect for use around pipes and penetrations that are already in place.
  • Protects the structural elements from water ingress & rising damp.


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Technical Details

Key Technical Data

5 °C to 35 °C
Externally, Internally
Exterior side of external walls, Interior side of external walls, Internal solid walls, Internal stud walls, Solid floors, Walls (solid stone, brick or masonry), Walls (timber frame)
Butyl rubber (waterproof)
3 months
30mm, 30mm
Silicone coated PE film, Two release strips
10 m
10 years (when correctly installed with Pro Clima system products only), 6 years (when correctly installed with non-Pro Clima products)
100 m
Elastic PE carrier film
Cross Laminated Timber (CLT), Lightweight construction, Massive construction (thick concrete), Metal frame, Solid stone, block or masonry walls, Timber frame
60+ years (following manufacturer's installation guidance)
Elastic PE carrier film
Aluminium, Aluminium / foil membranes, Chipboard, Hard plastics, MDF, Metal, OSB, PE, PA, PP, PET and foil membranes, Painted timber, Plywood, Pro Clima membranes, Rough sawn timber, Smooth planed timber, Solid stone, brick or masonry
Gypsum plaster, Lime plaster, Smooth cement (plaster or render), Smooth concrete
60 mm
Cable penetrations, Pipe penetrations, Timber wall to masonry floor junction (in timber frame)
Light blue
-20 °C to 80 °C
Airtightness, Wind/Weatherproofing

Technical Datasheet

Material Safety Datasheet (MSDS)


System Brochure

Brand/Manufacturer Brochure

Installation Guide

How to Install

Roll out the tape to the required length and cut to size.  Fold the tape in the middle and remove the first release paper.

Place the exposed sticky part to the pipe or cable and tape it around the pipe gradually, ensuring a good bond is being achieved on the material.  Remove the second release paper gradually stretching the tape to meet the other surface and apply pressure to achieve a bond between the two materials.

Once an initial bond is achieved between the two materials, a Pressfix should be used to gain a full-strength permanent bond.


Extoseal Magov bonded to a pipe penetrating an airtight membrane
Extoseal Magov bonded to a pipe penetrating an airtight membrane
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