Casemat machine-gun mount NPS-3

7.62-mm machine gun 'Maxim' on the casemate mount NPS-3 of 1939 model. White corrugated tubes are intended for suction of powder gases. On the top right is a tank of water for cooling the machine gun with it's water tubes go is seen. Water flows in the MG through the blue pipe, respectively, in the red one it flows out of the machine gun. Below under the machine gun there is a wheeled MG-mounts of Sokolov model is seen, that comes in a set for using the machine gun in trenches.