4mm Wedge Compression Back Gasket Double Glazing Rubber Seals

(12 reviews) Write a Review
GASK-WEDGE-4mm (W404) (5055621408037)
** OUT OF STOCK UNTIL 4th March - any orders will be despatched after this date **
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  • 4mm Wedge Back Gasket for UPVC Windows
  • 4mm Wedge Back Gasket for UPVC Windows
  • 4mm Wedge Compression Back Gasket
  • 4mm Wedge Gasket
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4mm Wedge compression back gasket


  • This gasket is only available in black.

Wedge gasket is fitted between the double glazed unit and the upvc frame to hold the glass securely in place. Over time these gaskets can shrink or perish and create gaps which lets in draughts and cold spots. It is important to get the right size of gasket as too thick will put too much pressure on the glass (if you can even get it in) and too thin will not hold the glass tightly. It is more often found on externally beaded windows as it works together with the bead to push the glass into place and create a secure fit.

When fitting wedge gasket you can push into place using your fingers or if you are doing quite a large area you may find a gasket roller better to use. Gasket rollers are available on our site by clicking here


As gasket is custom cut to the individual requirements we cannot accept returns. If you are unsure which gasket you need then please use our gasket sample pack:  

Click here for sample pack


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Frequently Asked Questions

Frequently Asked Questions

You should order per meter and we will cut to length for you. As it is cut to length we cannot accept returns. If you are not sure which gasket you need then maybe try the sample pack first.

Gasket can deteriorate and shrink over time so unfortunately we can’t identify your gasket this way. We recommend purchasing our gasket sample pack to see which gasket fits in your frame the best.

It is possible that a different gasket may work in your groove. Therefore, we have the sample pack, so you can try them and see what fits.

Generally by pushing bit by bit with your thumbs. With some of the chunkier gaskets such as wedge gaskets it can be done a bit easier with a gasket roller.

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Additional Information

Wedge Gasket
Pack Size:
Sold By The Metre
Sold By The Metre
Delivered from just £1.15
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12 Reviews

  • 5
    4mm Wedge Gasket

    Posted by Chris on Jan 29, 2020

    Good product, good price, good service. Buy with confidence.

  • 5
    fitted perfectly

    Posted by Bryan Leahy on May 20, 2019


  • 5
    Double Glazing Rubber Seals

    Posted by Robert Hiscock on Mar 27, 2019

    Extremely good service. Staff are friendly and professional. Delivered within a couple of working days. Product good and fits well.

  • 5
    Fitted great

    Posted by James smith on Apr 10, 2018

    No problem

  • 5
    very good

    Posted by J Menzies on Apr 04, 2018

    very good

  • 5
    4mm Wedge compression back gasket

    Posted by Joy Marter on Feb 12, 2018

    Very helpful company. I ordered enough to do just one room as I didn't know how tricky it might be. Turned out to be quite straightforward. Very pleased with the result and I will be ordering more.

  • 5
    With the samples we made the right choice so what we ordered was great and worked our windows

    Posted by Michelle on Nov 27, 2017

    Order the sample pack and u can not go wrong

  • 5
    Very good and very impressed

    Posted by Beryl Disney on Mar 02, 2017

    Very impressive service

  • 5
    Matched it using their samplerpack

    Posted by Teresa Curran on Dec 17, 2015

    Great product and service.

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