Steam whistle with chain, thread M6 for D12, D16, D161, D18, D20, D22, D24, T90
Nickel steam whistle with chain pull and M6 thread for the steam engines D12 (up to year of construction 2014), D16, D161, D18, D20, D22, D24, T90. Note: When using the steam whistles with chain pull, a spring safety valve must be installed on the boiler.