cockpit hose (and whiffle tree)
Never heard of using the sextant hatch as a vacuum cleaner in the RAF but pretty sure USAF did in KC135 (707) and C141 Starlifter. Sure there's a photo of a stream of paper cups being ejected from one or the other so must be ont t'interwebnet somewhere.
Whiffle tree was an arrangement in the feel sim to allow same feel whichever pump was working or pilot inputting. My tech notes are in the loft and I might get them out one day.