German Forces

German soldiers in Poland in 1939

https://www.google.com.au/search?q=pictures+of+polish+soldiers+1939&tbm=isch&imgil=c-kq2-i9VTLlvM%253A%253B_QM2tmghag7ImM%253Bhttp%25253A%25252F%25252Fphotosofwar.net%25252F1018%25252Fgerman-soldiers-in-poland-1939&source=iu&pf=m&fir=c-kq2-i9VTLlvM%253A%2

What are the pipes?