| http://www.w3.org/ns/prov#value | - The actuator (6) has a diameter of 25 mm and rests on the ledge in the upwardly projecting annular support of the cover (2 a); it is confined to the ledge by a top cap (7), made of plastics i.e. a non-conducting material, that screws into the upwardly projecting annular support and holds the actuator (6) on the ledge.
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