According to wikipedia
Bronze is typically 88% copper and 12% tin. Various other bronzes range from 90% copper down to mid-50s% copper, mixed with tin, lead, phosphorus, zinc, etc.
Red brass (also known as gunmetal) is 88% copper, 10% tin, and 2% zinc. It is a type of bronze. Again, some of the percentages can be a bit different.
Yellow brass is an alloy of copper and zinc. Different percentages give different strengths, malleabilities, and other properties.
All bronze and brass are copper alloys. The other metals alloyed with the copper give it unique names and properties.
From what I can see in the pictures, it looks like a red brass valve attached to a yellow brass fitting. The lighting could also be playing a factor.
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