Below is an old style drain cover
Here the gunite has been cut out to make room for the safety drain sump you will notice the top part of old drain plaster ring came loose so I had to cut plaster in a V shape to get a good mechanical bond for new plaster
Below I have plastered around new drain but unfortunately,somehow water got into pool after I left and the wind blew dirt into pool so the installation was not as clean as I would have liked.
I sealed the equalizer line below and capped it with plaster which saved the owner about 500.00 over fitting a drain cover for it!