Is that an Axsor air venturi or a G4 Air venturi ?Those are respectively FX and Hatsan pumps, I usetd to have 2 Axsors and both collected a lot of water, the Hatsans where pretty bad pumps too, I had 3 of them.
that's the green one right ?I used to turn them flat after use with the hose facing down and pump a bunch of times to expel all the water