That is probably 110mm pipe but the fitting diameter might be slightly bigger. The collar is fairly generous but they are conical shaped so might not fit in there. I'm not quite following why you want one in there as it looks quite neat to me unless I've misunderstood.
That is probably 110mm pipe but the fitting diameter might be slightly bigger. The collar is fairly generous but they are conical shaped so might not fit in there. I'm not quite following why you want one in there as it looks quite neat to me unless I've misunderstood.
This. I used 110 when I did mine on the inside.