I am trying to find out the name of a pre-cast concrete fitting that fits around a gully grid. This is a 3 sided box affair of the same section as the familiar round top path edging,the open side fits against the wall.
I am wondering if this item is a standard one or whether it it a bespoke item. No one seems to know what they are called let alone a supplier.
Most of them that I have seen are fitted to soakaway drains.