Abstract: Apparatus for keying the pivotal action of a lever action connector particularly where engagement criteria between the plug and receptacle is necessary to provide a multiple characteristic discrimination. The engagement criteria are incorporated between the complementary elements of the swivel means to render the assembly thereof impossible when an incompatibility exists therebetween. Each engagement criterion is attained by the compatible mating of a male key disposed on the receptacle with a female slot disposed on the plug. The engagement criterion may be either fixed or variable and if desirable, both fixed and variable criteria may be utilized in the same connector.