Worked for one soap dispenser but not another

I have 2 soap dispensers. It worked great on one but not the other. I think the tubing was too big for the first one so I was getting air bubbles. The other the tubing fit tight and it works great. The instructions state to remove the tube from the pump and hook the new tube they supply directly to the pump. Unfortunately the tube does not come out of my dispenser: UPDATE: THIS will not keep a prime. I thought it was going to be the answer to constant refilling of the dispenser for the soap. I threw it in the garbage

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