i have the same one but mine is an oriental print washer
there are 3 hoses .. one is intake one is a fat house for exiting all the water and
one is not as fat which controls the flow ( i haven't used it in years so i might be a bit off )
originally the 2 exit hoses had a plastic clamp ( went around the hoses and ratcheted / clicked with
your thumb and released just as ez ) you clamped them both shut when you fill it with water then you
release the narrow one ( from what i remember ) slowly to get equilibrium between the flow out and flow in ...
when you want to fully drain, you release the fat hose, repeat or rack the prints.
i used mine maybe a handful of times, but realized the prints got just as washed in a tray shuffled, filled and dumped ( less water too ).
and if you use something like perma wash or fixer remover your wash time / leech the chemistry out time is reduced considerably.
and it saves a ton of water. i think the last time i used it was in the mid 90s.
the posted instructions are for a film washer. it has a slotted basket for sheet film which can be removed so you can put reels in.
its basically a siphon that fills and dumps. ive got one of those and use it all the time. you can't blast the water, it won't refill. with the print washer
you WANT to blast the water so the cross jet-sprayers work.