In the 1960s, the complete range of fittings for the equipment of steam boilers was still produced by Leser. The whole range of boiler accessories was saved from the "Heinrich Kern" steamboat, which was scrapped in 1979. This was installed here on the boiler wall.
Water gauges were one of the main products of Leser. It was important to ensure that the supply line to the boiler was puncturable, otherwise there could be incorrect signals. In the 19th century there were different inventions for this which were patented.