Here are the parts that make up the hand water pump. This pump moves the water from the tank into the boiler before the fire is lit. There's quite a few different materials here - steel, stainless steel, copper, brass, aluminum, nickel-silver, rubber, and mahogany.
Finished, but not yet painted.
It bolts into the 3003 aluminum water tank. On the far side is the filler cap.
This is really jumping forward in time, but I wanted to show you what it looks like when finished.