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Weatherstrip? Comes in varying thicknesses, is self-adhesive. What I used on a similar window.
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https://www.ebay.co.uk/itm/324350466079
Primarily for uPVC, but the arrow shaped bit could likely be stuffed in that slot.
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Sorry for the late reply.
This is often used on timber frames with a rebate cut to take a seal barb.
https://www.screwfix.com/p/schlegel-aq21-window-door-seal-white-15m/2822PThe arrow headed rubber seals need to press into a C shaped slot, so the barbs can open out and hold it in
Stick on works to a degree bit it's a bit shit overall.
We have some wooden framed windows at the back of our gaff.
They are very draughty. There is no gasket on them.
It looks like there was a space for a gasket to be fitted? If that's what this channel is for, what product should I be looking for?
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