The APM Hexseal #60064 stainless steel and silicone rubber washer results in a high quality and long lasting seal of the switch mounting hole. It even seals the switch bushing keyway. If there is a risk of debris (cement dust, coal dust, ice, food residue, sugar byproducts, etc.) building up in the toggle actuator “recess”, consider the use of an APM Hexseal half boot. The half boot seals both the switch actuator recess and the switch mounting hole.