The Mark 93 is a thermostatic steam trap designed specifically for use in clean steam systems demanding that sanitary conditions be maintained. It features a 20Ra internal finish, and a self-draining design, to minimize the possibility of medium entrapment and bacterial growth.

The MK93 has been specifically designed to provide higher flow rates at low pressures and low subcooling levels. In lab testing, the Mark 93 has exhibited excellent flow rates at subcooling levels of only 5°F (28°C).