I have a solution that works well!! Add a kangaroo port to the gtube port. Add a little plumbers tape (Teflon tape) to the purple "Christmas tree" end before shoving it into the gtube port. It is for plumbing and is non toxic. It works awesome!! You could probably add it to the feeding tube end but would have to reapply it each time. The kangaroo is better and you can replace it fairly regularly. Jane