Reddit reviews Thomas 2857 Gum Rubber Red Extruded Vacuum Tubing, 11/16" OD x 5/16" ID x 3/16" Wall Thick, 50' Length
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Red extruded vacuum tubingFlexible, smooth walled tubingHigh quality gum rubberMeasures 11/16" OD by 5/16" ID by 3/16" wall thick by 50' length
Here's tubing on Amazon UK.
Stoppers. No holes, but you can buy a hole-cutter for stoppers (or make a jig to hold it and just drill a hole). You might be able to find some with holes if you look around some more.
Pyrex/borosilicate tube should be pretty easy to find as well. Usually you buy long pieces and cut and bend as needed.
Just in case there are US readers, I got these for this kind of old-school stuff:
I bought stoppers with holes and glass tube, and gum rubber tubing with no problem. That's thick-wall tube for use with vacuum, see the related products for cheaper thin-wall tubing.