Hellermanntyton straight cable conduit fitting brass nickel plated sc fm hellermann tyton 166 30316 the hellermanntyton 166 30316 sc25 fm pg21 is a brass connector for metallic conduit from the sc fm series the connector has a swivel external pg21 thread and comprises of two parts the shell and the body the connector has been manufactured from nickel plated brass hellermanntyton 166 30316 sc25 fm pg21 helaguard metallic conduit screw fitting