MML-B model lever operated monitors are constructed by casting methods from bronze or aluminum alloys according to request. While cast bronze monitors are heavier and generate slightly greater pressure losses for a given nominal pipe diameter they are usually more compact and robust than fabricated steel units. However, there is a wide range of materials which are called “bronze” and it is important to determine the specification of the material used when judging strength and corrosion resistance. The same form and shape of these monitors with aluminum alloys are available on request.