"NY's paint scheme is actually good design. Up here in Canada, there is no colour designation and it's relied on signage to describe what the Siamese connection is for. Also the term Siamese connection is getting phased out for Fire Department Connection. The reason they have two 2½" connections is to get the volume of water into bigger systems (because 2½” used to be the largest diameter of hose trucks carried) it's a legacy thing in the building codes, pretty much all pumpers across north America carry 4" hose now. One day we might start to see single 4" FDC's at buildings. "