This is so simple. Use the plunger to suck up a gulp of hot water and just squirt it into the boiler. It takes seconds!
And then suck out excess water after the steam-up.
The metal end piece is the right length to fit into the boiler to then be fed to the bottom when emptying the unwanted water after a steam up.
I can't say it's a life saver but boy, it will extend your life by ten years through reduced stress of filling hot water into the boiler and getting it all over your shoes.
The curved brass tube is shaped to allow you to fill and empty without removing your canopy when fitted. Especially helpful for Showmans Engines.
This means you can easily pop that into the boiler, it won't fight to come out again, and neither will you melt the PVC tube on a hot boiler when prepping for a second run.
Smashing way to go. A brilliant idea. Queen's Award to Industry?
And money back if you don't like it!