This one has a light trap quite unlike the central column of my two reel Paterson. Appears to be light tight even with no reels installed
mschem was pointing out that the drum you have is for prints, not films.
They were designed to be used horizontally, and with much less liquid in them then the amount you would need for film, because prints would adhere to the walls of the drum, while film on reels needs to have the liquid reach near to the centre of the drum when it is lying on its side.
The print drum would be very slow to fill and empty, if your intent was to try using them vertically. In addition, you probably can't invert them for agitation.
In addition, the liquid flow would be unpredictable in a tank with reels that are too small - uneven development would be a real possibility.
And finally, developing film with steel reels in those tanks would sound awful!!!!