A connector cap comprising: an inner housing comprising a first top wall, an essentially cylindrical first sidewall, and an open bottom formed by said first sidewall with an opening to an inner cavity within said inner housing for receiving a hub of a needleless connector, characterized in that the inner housing further comprising at least one cap thread on an inner sidewall surface of said sidewall, said cap thread being sufficient to interlock with a mating feature of said hub of said needleless connector; the connector cap further comprising: an outer housing comprising a second top wall configured above said first top wall, and an essentially cylindrical second side wall configured to essentially surround said first sidewall; and a safety interface comprising a first portion configured on an outer surface of said first top wall, and a second portion configured on an inner surface of said second top wall, wherein said safety interface transfers a rotational movement of said outer housing in either direction to a rotational movement of said inner housing in the same rotational direction when said first top wall and said second top wall are urged toward each other and said first portion and said second portion engage, and wherein said outer housing is allowed to rotate with respect to said inner housing when said first top wall and said second top wall are not urged toward each other so that said first portion and said second portion do not engage with each other. an inner housing comprising a first top wall, an essentially cylindrical first sidewall, and an open bottom formed by said first sidewall with an opening to an inner cavity within said inner housing for receiving a hub of a needleless connector, a first top wall, an essentially cylindrical first sidewall, and an open bottom formed by said first sidewall with an opening to an inner cavity within said inner housing for receiving a hub of a needleless connector, characterized in that the inner housing further comprising at least one cap thread on an inner sidewall surface of said sidewall, said cap thread being sufficient to interlock with a mating feature of said hub of said needleless connector; the connector cap further comprising: an outer housing comprising a second top wall configured above said first top wall, and an essentially cylindrical second side wall configured to essentially surround said first sidewall; and a safety interface comprising a first portion configured on an outer surface of said first top wall, and a second portion configured on an inner surface of said second top wall, wherein said safety interface transfers a rotational movement of said outer housing in either direction to a rotational movement of said inner housing in the same rotational direction when said first top wall and said second top wall are urged toward each other and said first portion and said second portion engage, and wherein said outer housing is allowed to rotate with respect to said inner housing when said first top wall and said second top wall are not urged toward each other so that said first portion and said second portion do not engage with each other. an outer housing comprising a second top wall configured above said first top wall, and an essentially cylindrical second side wall configured to essentially surround said first sidewall; and a second top wall configured above said first top wall, and an essentially cylindrical second side wall configured to essentially surround said first sidewall; and a safety interface comprising a first portion configured on an outer surface of said first top wall, and a second portion configured on an inner surface of said second top wall, a first portion configured on an outer surface of said first top wall, and a second portion configured on an inner surface of said second top wall, wherein said safety interface transfers a rotational movement of said outer housing in either direction to a rotational movement of said inner housing in the same rotational direction when said first top wall and said second top wall are urged toward each other and said first portion and said second portion engage, and wherein said outer housing is allowed to rotate with respect to said inner housing when said first top wall and said second top wall are not urged toward each other so that said first portion and said second portion do not engage with each other.