I have a couple of gullies that take the waste water from hand basin and a
kitchen sink. These are clay and square in section with a concrete surround
that does a terrific job of catching the leaves in autumn. Now I know you
can get covers for these things but I think they are unsightly and at almost
a foot square a bit of overkill to take a 2" diameter pipe. So, does anyone
know of an adapter that can convert these gullies into circular types with a
screw-down lids?

Thanks

Ian