The inlet diameters and the machine output are identical, which is a source of error.
After exchanging the pipes, is misery. The flow is 100 times too slow.
I had a pump in a large auto center that was draining in 5 minutes.
Here it takes one hour minimum.
It really is a bad product, poorly designed, of incomparable quality with competitors.
I confirm the reviews below: fleeing absolutely!
I'll put it straight in the bin.
Finally I made the drain from underneath the car, like the old ...