Might be a good idea to read 2.3 of the mot testers manual as it is a reason for refusal/VT 30 for parts of power steering being removed so its possibly an iva fail too.

Beg to differ on the power steering with no power
Yes may be an MOT falier if the car was fitted with it in the first place
There is no resistance in the rack any more than the fact the rack is quicker than standard
The fluid just moves round as you turn
However the quick rack internals for a standard rack are cheap enough but require a standard rack and a strip down to fit
Something I am now doing

Interesting thoughts,one way valves,and pressure on a ram inside the rack are usually the way power steering works.

I would have thought if the rack was filled with fluid and blanked off,liquid not being compressable would lock the rack as one side would work against the other.

It does say "if fitted to the vehicle" so it is a moot point if it could lead to a fail.

It is a cheap way of getting a quick rack !

All the valves are around the pinion
Rack is just a piston and two feed tubes