GAGALIFE Kitchen Sink Soap Dispenser with Large Bottle (Brushed Nickel), Built in Sink Soap Dispenser Refill from Top

Q: What is the diameter if the hole that is needed in the counter top?

The base of the dispenser is ~ 1.75 inches (diameter). My drilled hole is ~ 1.5 inches (diameter) and is completely covered by the dispenser. Hope that helps.

Q: My pumper isn't pumping. Are all makers univesral for fitting?

I don't know but would think so. Perhaps your pump isn't working because the soap has dried up. Try a poke with a paper clip wire at the outlet or inlet or maybe a cycle in your dishwasher will free it up.

Q: What type of liquid soap works best to prevent the dispenser from clogging?

I'm using a watery soap and it works great. I haven't tried a more viscous type such as gooey dish soap, but the outlet is pin-hole sized so it might get clogged with thicker soaps.