Hard to get! Pt no 6002B  for Wilesco D366/D376 D406/D416. Consisting of No60B Steam supply pipe (threaded both ends ) &No 62B Steam exhaust pipe  Threaded cylinder end.   You can also use this part along with part nos 55 Bcylinder & 6002B pipework to turn your production built engine into one you can take apart and rebuild without the need to do any soldering.!