It definitely works for the EveryYay Get Fresh Cascading Stainless Steel Deluxe Pet Fountain, 60 fl. oz. That’s what I have. 

There is no slide on my Harmony replacement.  It seems the pumps get slow after a year. My replacement pump really provides a good flow of water.

If you're using the Petmate fountain this pump won't work. If you compare them, the Petmate has a long stem with a lever at the bottom of the pump that sticks out into the bowl so you can adjust the water flow down the slide. This pump projects the water upwards for those fountains that have a different recepticle.

yes, it has a transformer that plugs into the wall.

1 1/2” x 1 1/2” and a little over 1” high, hope this helps.

As far as I know, there is no way to adjust the flow.  Do you have the silicone connector nozzle/emitter/outflow (not sure what to call it) seated properly?

Not sure if it will work for that particular fountain.  I do know I purchased it for a ceramic pet water fountain I purchased years ago from a different pet supplier.

Yes, I had to order one also. I just googled replacement parts and it came up.

It's a very weak pump without a large enough filter to adequately filter even a small aquarium. You'd be better off with a sponge filter or inexpensive power filter for an aquarium.

I sent this back as it was not made for a small pet fountain for cats. I think the cord is a foot... maybe 2 maximum.