There is a newer version of the New York Consolidated Laws
2006 New York Code - Piping From Siamese Connection.
§ 27-960 Piping from siamese connection. Piping from the siamese connection shall be the same size as the riser or trunk main to which it is connected, except that it need not be more than five inches in diameter when supplying larger riser or feed mains. When more than one siamese connection is required, the piping from each siamese connection need not exceed four inches in diameter.
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