Hydrovane Type Air Compressor
One portable diesel powered air compressor trailer.
They were used at a massive variety of railway and industrial sites including Depots, Yards, Workshops, Building sites etc. 
TT:120 Scale
The model is a one piece resin item with a length of rubber hose supplied that can be fitted as desired.
This model is supplied unpainted for you to paint to your own specifications. It's recommended to apply a light coat of primer paint first.