I have a Rena XP 2 that was spitting air. It was driving us nuts.
I checked everything and couldn't find a leak. Put new vinyl hoses on it,
cleaned the impeller assy, re lubed the o-rings & seals.
The original hoses wee opaque. The vinyl ones are clear, when I lookied
at the intake hase while it was pumping, I could see air bubbles. So I taped it up.
Here is my first thread:
Rena SP2 pumping bubbles
Then I found ABOUT where the leak was:
It was a primitive fix but till I can order a new intake neck it'll do.