Yes the water cannon or the monitor as they were then called were fitted in this era, [you can see it on the small plan taken from a similar tug in the Empire Tugs book] one still to be seen on the 1946 empire tug Cervia at Ramsgate, and the water main and monitor should really be grey but the crew have not got round to painting it yet!! Seriously I got a bit fed up with all the grey so left it red to lift the model abit [modellers licence??]