Must have been a case of them using what was available at the factory, or a case of repairs at a later date, because the visi that I posted a picture of, came on the pump when it was removed from the island it was being used on.
I checked my other 2 40's and the rare 861/40 clockface that I have, and they all have the straight down outlet.
My 861 does have the angled outlet and my 851 has the double visi.
Like DB always told me, there is no exact science to all this because on any given day, they didn't stop making the pumps because a certain part wasn't right, they just used whatever was available.
