I have a sd-60 sand filter above ground. what is the part called that has like a screen that is shaped like a 6 slices of apple pie , may or may not have had a small dome on it

You may be referring to the Standpipe Assembly, which has six Laterals attached, which help filter the water through the sand. They are in stock as individual units as is the standpipe assembly as a whole. You can see a diagram of the filter's parts here.
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