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Can you post a picture here of the device you're having trouble with? you can post a pic here by clicking on ADD FILES next to the SEND button
Sorry, I had to step away for a while. Both your picks are the same. Please try again but if your existing dispenser is like almost all of them your going to need a basin wrench (see attached pic) to get it off and install the new one. I'm just checking in before I log off for the night. I'll respond tomorrow.
Since virtually all soap dispensers are installed with a basin wrench I need a picture of the problem connection if you'd like my help in getting it off