Ray Andraka opined

I'm surprised no one has mentioned wet vacuum pumps. I'm considering a
wet pump when the current dry pump gives up the ghost, as it sounds like
wet pumps are nearly bullet-proof. That said, I have been lucky in that I
still have not had a vacuum pump go out on me. I have had several gyros
fail though.

At one point I thought about replacing the dry pumps on a Twin Comanche with
wet ones. Seems that you need to go through a bunch of STC or 337 field
approval paper work to do the swap. So I dropped the idea.



-ash
Cthulhu for President!
Why vote for a lesser evil?