Hellermanntyton brass conduit connector sc sm series hellermann tyton 166 30415 the hellermanntyton 166 30415 sc25 sm pg21 is a brass connector for metallic conduit from the sc sm series the connector has a swivel external pg21 thread and comprises of two parts the shell and the body the connectors have been nickel plated hellermanntyton 166 30415 sc25 sm pg21 brass conduit connector pg21 211mm