Fiamma 23 Litre Portable Fresh Water tank

The opening in the Fiamma is certainly wide enough for the pump but the tank is quite shallow so you will struggle to pump all the contents although I think the pump will probably lay fairly flat in the bottom. The dust cap won't fit as the opening is bigger than the Aquaroll.

We used the Fiamma for waste and it's fine but you would be better off with a deeper container for fresh water.