Liquid hand soap refill aid
thingiverse
This is a threaded adapter to help you drain the last drops of liquid hand soap from a refill bottle into the dispenser. (It's not useful for the initial refills, but those shouldn't be a problem.) I don't know how standardized the thread sizes are on these bottles, so here are the measurements for the ones I designed for: Top: Equate 56 oz. refill, 32mm outer diameter, 30mm root diameter. Bottom: Softsoap 7.5 or 11.25 oz., 27mm outer diameter, 25mm root diameter, 20mm inner diameter. Both threads are 6 TPI (4.23mm pitch), which does seem to be fairly standard.
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