If any section or portion of a section of this subchapter is held to be invalid for any reason, all valid parts are severable from the invalid parts and remain in effect. If any section or portion of a section is held to be invalid in one or more of its applications, the part remains in effect in all valid applications that are severable from the invalid applications. To this end, all provisions of this subchapter (relating to Administrators) are declared to be severable.