Albert Adjustable Roll Film Tank - How does it work?

I recently bought an Albert Adjustable Roll Film Tank at a garage sale in the hope that it would allow me to develop 120/220 roll film. I think the film will fit - but the design of the tank baffles me. The tank is made out of plastic or Bakelite, and has a top that does not screw on. It has a hole in the centre of the funnel-shaped top, obviously to pour in liquids. It further has an opening at the side of the top, apparently to pour out the liquids. The whole thing leaks liquids like a sieve when inverted. Questions: 1. is this thing supposed to be light tight? 2. How does one agitate if not by inversion? 3. Is this tank designed to be used in a darkroom, where the liquids can be poured in with lights on, and agitation is supposed to occur with lights out and tank top off by turning or lifting the spool? 4. Is this tank a waste of my $5? (It seems to require about 750 ml of soup!) Any help will be greatly appreciated! Paul

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