My next project is laying a patio, and I want to include a ground socket for a rotary washing line. It'll be concreted in, so won't be easy to replace later without damaging the slabs.
Is there a standard size for washing line ground sockets? I hope the patio will outlive the washing line.
Also, are there any recommendations for good sockets? I don't mind spending a bit more on a decent metal socket if it'll last better than a plastic one.