These are very well made marine plants and run extremely smooth at high speeds. I had to do some small restoration and mount the plant as you see it the the engine was perfect. They are small and come standard with Stephenson reversers, which are operated via servo from atop the boiler from a linkage which also acts as the pressure relieve valve. This engine was made in the 70s, as was the burner and boiler. Boiler capacity, according to small a amount of documentation I got with the pieces, is listed as 693 grams. (Never heard of Boiler capacity listed that way)