I have an eshopps hang on that's rated to I think 30. If you want it just come pick it up.
It's sensitive to feeding with the oils in the food but it worked when I used it for a 20L. You need to shut it off before you feed and keep it off for a few hours after. It's one of those where you have to pinch the airline and play with it a bit to prime the pump but once you get the knack you'll be good to go.