Plumb centre or most plumbing shops b&q will have gutters of various sizes and also supply the rubber gaskets for your size of gutter. You will have to
check the depth and width of the gutter and check the joints as this may have writing on the plastic joint telling you the make and also the size of the gutter making it easier for the warehouse personel to find a replacement.
is really worth replacing the rubber?? just renew the whole joint, see if the gutter type is printed on the length of gutter and get the pieces to fit it. thats what i would do rather than fiddling with the rubber replacement.
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