 However, they take longer to install than soldered (aka sweated) joints and sometimes require re-tightening to stop slow leaks which may develop over time.Because of this possible leakage, they are generally restricted to accessible locations (such as under a kitchen or bathroom sink), and are prohibited in concealed locations such as the interiors of walls.Flared connectors should not be confused with compression connectors, with which they are generally not interchangeable.