Iron | Aluminum | AWWA | Stainless Steel | Severe Service Stainless Steel  General Maintenance | Installation & Operation Manual | Service Options Iron gear operators are heavy duty, utilizing iron and steel component construction. These gear operators are used on ¼ turn products such as industrial dampers, ball valves, high performance butterfly valves, and plug valves. Aluminum gear operators are for lighter duty applications, utilizing aluminum external and iron and steel internal construction. These operators are normally used on lower pressure rubber seated butterfly, small ball valves, and low pressure damper applications. AWWA gear operators are manufactured to the requirements of the American Water Works Association specification C504 for use on ¼ turn valves in water and waste applications. Stainless Steel gear operators are heavy duty, utilizing stainless steel external, iron, bronze, and steel internal components in their construction. These operators are normally used in the same applications listed for iron or aluminum operators, but where the specification includes extensive consideration for corrosive environments. Stainless Severe Service gear operators are heavy duty, utilizing stainless steel external and internal components in their construction. These operators can be used in applications where the specification includes extensive consideration for corrosive environments including marine deck service, chemical processing, leaching operations, food processing, and nuclear non-confinement (glove box).