In message , harryagain
writes
You do realise that different manufacturers products are often
non-interchangeable?
Some can be "persuaded" others not.

It should be a tght fit.

Well, he hasn't found anywhere locally that will sell him 135deg corner
pieces, so we will either have to get 2 metre lengths of guttering by
post or find some of the rubber gutter-sealing section to stick on the
outside of the gutter he already has.

This brings back the question of whether this rubber seal, or something
squishy and rated for external, is available. I suppose big gobs of
sealant would do.
--
Bill