Hi Tim,
I used to be an agent for Stimvak and it is true that the Toto Machine was used for dry cleaning.
What you have to be sure of is that the pump has a viton diaphragm, seals and valves.
You must also make sure that you are venting the vac exhaust outside via a hose fitted to the motor.
They are a good simple machine that does the job.
If you are interested I have a spare water Toto for sale ( Machine only.also I think some dry cleaning tools. and various spares.
Regards Tony Harrison