These are replacement bowls, or enclosures, for AARGA Series of raw water strainers, which are AARG all bronze strainers, but with a second, alternate, outflow port in the enclosure.
Note: The head/enclosure mating bolt pattern is the same whether the head is 1-1/2", 2", 2-1/2" or 3", so the same enclosure will fit any of these size ARG strainer heads.