This is the end of a a pressurized tank from a 1921 American LaFrance firetruck on display in the Kansas Firefighters Museum in Wichita, Kansas. I'm not entirely sure if it was filled with water or some other fire suppressing agent. There is a pair of valves, a pressure gauge, and a crank(!) on the other end of this tank.

You'll find a wider view of the truck HERE. This tank can barely be seen under the seat at the far right center of that photo.

If you've looked through my gallery, you know I like shiny, metallic things. I love the fact that a lot of firefighting equipment can be so functional and beautiful to look at at the same time.