There are only a couple of important parts between the engine and the boiler. There’s an in-line oil reservoir to help combat the corrosive nature of the steam. There is also a check valve.

Also for $29.99 is the Exploring Kid Steam Engine Kit. This mostly plastic kit, when assembled, includes a boiler and tube leading to a piston. Due to the open flame and numerous small parts ...

We’d love to see the same experiment done with a piston-type steam engine, too. Video after the break.