Defrost frozen valves, using steam hoses.
- 51-8021.00 Stationary Engineers and Boiler Operators
- 51-9061.00 Inspectors, Testers, Sorters, Samplers, and Weighers
- 51-4021.00 Extruding and Drawing Machine Setters, Operators, and Tenders, Metal and Plastic
- 51-4081.00 Multiple Machine Tool Setters, Operators, and Tenders, Metal and Plastic
- 51-8013.00 Power Plant Operators
