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I guess choosing the right product is a case of understanding the size of the gap between the frame and window when closed and the size of the slot.
The closest from the samples seemed to be the B035 from this lot
Can't help but feel the push fit was too loose, the slot seems quite cavernous on our frames.
Howard-
I guess choosing the right product is a case of understanding the size of the gap between the frame and window when closed and the size of the slot.
Exactly this. When the window was made, they would have a seal available and cut the slot to suit the requirements. Now it's a case of finding something that's close enough and realistically available. Obviously you want some compression but not too much or you can't shut the window and that's often only noticeable once it's all fitted.
The closest from the samples seemed to be the B035 from this lot
Can't help but feel the push fit was too loose, the slot seems quite cavernous on our frames.
B035 is still a upvc seal, so the arrow needs to press into a C shape groove so the barbs open up and grip. It won't grip in a straight sided slot.
The Exitex 8mm tubex seal that I have, or the Aq21 may work if your slot is 3mm or less
If the slot is bigger than 3mm, you can have a look at these two catalogues to find a suitable one ( alternatively use the Aq21 and staple/glue it in place)
https://www.exitex.com/assets/downloads/New_High_Res_Joinery.pdf
user69121
The Aq21 is the probable reasonable fit thats available in small quantities. There's hundreds available if you want to order a 100m reel.
I have most of a reel of Exitex 8mm joinery seal left. It has a double barb unlike the upvc seals. With the position of your rebate, I don't think it's the best choice but your welcome to some if the link above isn't working out.