Christopher.
I fully agree the proof is on you photo, no doubt it is a third valve connection, I failed to see that. Again I don`t know the torpedoside of the system, but if somebody has not messed around with the T-handle this valveconnection with a handleball should be in direct connection ( shortcutting the mainvalve) with the sea. The 90 degrees T-handlebend should indicate the type of the connection, fuel, air or steam. I don`t see fuel as an alternative, air could of course be weedblowing, but that was usually not a T-handle but a small wheel. The valve is placed in the bow area, in bad weather the bow was frequently above the
surface, U 995 was operating in the Arctic, Barents sea, theoretically it could be a steam deicing connection, although I never heard of it and I cannot remember any icing problems in this area. Below I have indicated the two handle alternatives if you are able to identify the type on you photo. You drawings are absolutely of professional standard and a pleasure to look at.
Tore