Non-boat users may not be aware but the chimney on a narrow boat has a lid to keep out rain and the flue pipe itself is removable for reducing height under low bridges.
Having nothing better to do, I took to scraping off the paint and polishing up the brass. Quite successfully actually. And cheaper than buying a new one.
Probably the brass was painted because brass, looking good when polished, is a beast to keep shiny. I promise to give it one more buff then lacquer it to keep it bright.
Here's a pic from Ely Chandlery showing a spanking new flue pipe.
Ours looks a little bit like this (after an hour's polishing ...) But look at the little hook on the side. Is that for anchoring the pipe in a brutal storm? And ours has a double skin, keeping the hot gases separate from the outer decorated skin. Is this normal, or are we posh ?