Caravan Window Seals

[Chrisgr31]

I have bought replacement window seal for my caravan windows. I bought 27mm seal as thats what I measured at the time. Now the old seal is off I realise I should have got 25mm seal. Is it absolutely essential I use 25mm seal?

[volks al]

pretty sure thats the frame width, your one will be slightly larger I guess and may not be a tight fit in the frame.