Abstract: A connector includes a cylindrical body having: a first threaded section at a first end of the body; a second threaded section at an opposite second end of the body; and at least one of the first or second end of the body has an opening and chamber formed in the body, the chamber having a chamber bottom positioned between the first end and second end, wherein the first threaded section and second threaded section having a same threading pattern and capable of being threadedly coupled to a same threaded receiver so that the connector is bidirectional. The first threaded section can be on a first stem and second threaded section is on a second stem. The first threaded section can be on a first receptacle and the second threaded section is on a second receptacle.