Some advice if you want: It sounds like you have what you need. But I have a Subaru Forester and filling the 2 differentials plus CVT was a royal pain. First I tried squeezing quart bottles with a hose cap etc (nighmare). So I also bought one of these pumps and found it very underwhelming. VERY slow transfers as you say. Plus the hose that comes with the cheap pump was stiff plastic and easily jostled out of the fill hole (while pumping forever) or slipped off the spout nub making a big mess periodically. Plus one pump broke in the middle of a transfer making a mess. It was exasperating over something that should be easy. To compound matters, the Subaru CVT also has VERY high fluid capacity to make use torture. Heavy gear oil for differentials also did not pump very well in the small plastic pump and the front differential had a fair volume of it too.
So I tried two things. First, I replaced the hose with a longer and very supple silicon hose. This helped a lot. But still ended up taking forever and messy. And when you have a zillion strokes to fill, things tend to go wrong.
So next, for lower differential volumes in awkward fill positions (front differential fill hole is awkward) I switched to a larger size Mityvac "extractor" syringe like this:
https://www.amazon.com/Mityvac-MVA6852-Fluid-Extractor/dp/B0741G9P6R/?tag=atomicindus08-20
This worked much much better. I would take the plunger off the back of the syringe, then pour gear oil into it with the hose capped so it would not leak out, and then use the syringe to squirt the gear oil in. Then repeat cycle till the differentials were filled. This worked fine without too much mess -- even with heavy gear oil.
For the CVT (huge volume) this was not tennable unless you want to fill the syringe all afternoon and accumulate a big mess of spills and drips. So I used a larger size Mityvac floor extractor/dispenser pump that I sometimes use for brake & power fluid fluid extractions and lawnmower oil changes. I cleaned the extractor/dispenser out well from old oil and let the solvents dry, then filled it with new CVT fluid, and used it transfer pump into the CVT till filled. This was very quick and clean. If I had a shop, I would buy a few of these and leave one for transmission fluid types and another for gear oil to avoid much of the cleaning prep issues to get ready to use for dispensing new fluid rather than extraction of old fluid. This one Mityvac floor model is the same or very similar to what I used as a dispenser:
I think you can buy Mityvac clones for both of these at Harbor Freight. The Harbor Freight models might be ok enough and a bit cheaper than Mityvac models.
