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MF25 Screw-FIX Insulation Back Filler x 125mm (5 inch)

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From £57.50

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The Screw-FIX Insulation Back Filler is a new concept to make the job of back filling your chimney with vermiculite as easy as possible when using a Screw-Fix pot hanging cowl.


1. Firstly drop your flue liner and neatly cut the liner flush with the top of the chimney pot

2. Screw the back filler onto the flex.

3. Fill the back filler with vermiculite, agitate the back filler if required and repeat the process until the chimney void is completely full.

4. Unscrew the back filler removing any excess vermiculite.

5. Screw the cowl on making sure it screws down on to the top of the pot as far as it will go.

6. Secure the jubilee band fixing making sure the cowl is secured tightly to the pot.


It is recommended that chimneys serving solid fuel appliances be swept and maintained as frequently as necessary but at least once a year.

Weight 2 kg


Its sometimes difficult to choose the correct size of Chimney Cowl. We have the perfect solution and can be done from ground level as well. If you can accurately guess the size or width of the chimney pot from the floor you can order the right Cap or Cowl from Chimney Cowl Products. The good news is this is relatively easy once you know the rough size of a house brick and the thickness of the walls of a chimney pot. Using either the naked eye or a set of binoculars get a ‘side on’ view of the chimney pot you wish to cap or fit a chimney cowl, then find a full sized brick nearest to the chosen pot as a reference, normally directly underneath. Now imagine that the brick is placed on top of the chimney pot itself and make a mental note whether it would fit inside, hang over, or sit flush. It may sound silly but once you know that the width of an average UK house brick is 225mm ( 9″ ) for imperial or 215 ( 8 and half ” ) on a modern property, it provides a very accurate impromptu tape measure. The other factor you may need is internal pot size, this can also be guessed quite accurately if you know the average thickness of a chimney pot is about 25mm ( 1″ ) , simply factor this in and you can work out most chimney pot width’s quite accurately. If you have large decorative rolls on top of the pot, make an allowance for this by guessing, using a brick as your guide.
Chimney Cowl Products - Your family run business proudly capping the UK for over 15 years...
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